HOME:
Current Soil Health News from
Hoorman Soil Health Services

Sceptics of soil health abound in agriculture. After World War II, farmers became reliant on inorganic fertilizer to improve crop yields. Soil organic matter (SOM) levels were still high, so an investment in fertilizer gave big yields. Today, most soils have lost 50-80% SOM, so it takes more fertilizer and environmental problems are getting worse. With improved genetics, crop yields continue to climb but at a much slower rate than most scientist predict. Soil pests like weeds, insects, and diseases continue to persist. While yields have improved, the nutrient density or mineral and vitamin content of our food is much lower than it was in the 1950’s. Fertilizer, genetics, and new technology (all man-made innovations) have a limited ability to improve our food supply without Mother nature’s help from microbes recycling nutrients and sequestering soil carbon. Improving soil health is all about using all our resources (man-made and natural) to enhance crop productivity. Farmers should want...

Getting a good cover crop stand after harvest can be difficult, so farmers are inter-seeding cover crops early into standing corn. Benefits include erosion control, extra nitrogen from legumes or clovers, using grasses as nitrogen scavengers, weed suppression, and livestock forage (grazed or hayed). Inter-seeding cover crops into corn early takes some planning; especially on timing, planting equipment, and selecting cover crop mixes, seeding rates and herbicides. Timing is critical so inter-seed before the corn canopies but not too early so that corn has to compete for moisture and sunlight. Penn State research shows that about V5 (V4-V6) or when corn has five true leaves is the ideal time. Planting earlier than V4 often results in competition from the cover crops and corn yield losses. Planting after V6 may be successful, but the amount of cover crop biomass may decline due to moisture and sunlight limitations. The goal is to get a head start on cover crop growth before corn is harves...

Bio-stimulants include both bacterial and fungal inoculants, various types of compost, and organic adjuvants that stimulate plant growth and improve yield. Farmers have been using bacteria inoculants containing Rhizobia bacteria on legumes and clovers like soybeans, alfalfa, and red clover for many years. Each plant has a specific Rhizobia bacteria inoculant needed to maximize nitrogen production. Rhizobia take atmospheric nitrogen and convert it to plant available forms of nitrogen in the nodules. Inoculants for soybeans and alfalfa may last 1-2 years while cover crop inoculants are short lived, lasting only 12-48 hours. Many farmers buy pre-inoculated seed but exposure to sunlight and temperatures above 500F often make them ineffective. For best results, always inoculant cover crops legumes (winterpeas, vetches, cowpeas, Sunn Hemp) and clovers (crimson, Balansa, red, sweet) at planting and buy the right inoculant species. Other inoculants are fungal. There are over 150-250 different ...

Farmers who improve soil health increase the amount of soil carbon being stored, and recycled. The increased carbon flow increases microbial numbers and efficiency leading to improved plant photosynthesis. The entire soil ecosystem functions at a higher level. The overall effects are healthy plants that have less disease and insect issues and higher overall yields. Soils high in soil organic matter (SOM) allow carbon to cycle in many different forms. The soil microbial community adjusts to these changes in the quantity of recycled carbon and nitrogen and this has an effect on the amount of phosphorus, sulfur, and micro-minerals released in the soil. Many of these trace minerals like manganese, iron, copper, and zinc are essential micronutrients needed to suppress disease. Plants activate plant proteins into enzymes to fight diseases using these micro-nutrients as co-factors. All soils have pathogens but healthy soils can tolerate these pathogens because healthy plants have the ability ...

No-tilling corn is a difficult transition for most farmers. When farmers start no-tilling, the transition time may last 3-7 years and corn yields may often be reduced during that transition period. An alternative is to strip till the soil which gives a farmer some of the benefits of each tillage system. Strip-tillage is minimum tillage 6-10 inches wide and 3-8 inches deep in a band where the corn seeds will be planted next year. The area between the tilled strips is no-till which allows the soil to be protected by crop residue and/or cover crops. The tilled zone typically driers out and is warmer in the spring, promoting good corn germination.  Typically, a farmer will pre-form the strips in the fall using specialized equipment, although sometimes the strips are formed in the spring, depending on weather conditions. Generally, strip tillage reduces the number of field tillage operations down to one or two passes compared to several passes using conventional tillage. Most strip till...

Indian Summer is here with warmer temperatures and some sunlight as farmers try to finish up harvest. A lot of field work is being done including deep and shallow tillage. A farmer down the road from my house, did some deep ripping on very wet soils. When he left, I think he might have left half the field on the road! Even though we had extremely dry weather this year, recent rains have kept our soils really moist, even muddy. As farmers, we might want to think about what long-term damage that tillage equipment might be doing to our soils. The following information comes from an article I co-wrote on “The Biology of Soil Compaction” Journal of No-till Agriculture in 2011. Soil compaction is a common and constant problem on most farms that till the soil. Heavy farm machinery can create persistent subsoil compaction. Scientists have found that compacted soils (a) physically restricted root growth; (b) decrease root zone aeration; and (c) reduces drainage, (d) increased losses of nitrogen...

As fall harvest progresses, farmers are looking ahead to next year’s crop. Corn and soybean farmers utilizing no-till and/or cover crops may need to make different management decisions than conventional tillage farmers. Enclosed are tips for managing cover crops and making fertilizer adjustments. Legumes and clover cover crops are usually planted before corn because they make nitrogen (N). Legumes and clovers maximize N production (85-90%) at blooming, so terminate these cover crops before they set seed and the N is ties up. Most organic N is in the leaves and becomes available to the next crop 2-5 weeks after they decompose. Most no-till farmers add 40-60# N in a corn starter to stimulate early corn growth, when soil microbial communities are lower and recovering after a cold winter. Microbial populations increase exponentially with moisture and warmer soils in late spring and early summer, recycling soil nutrients to the next crop. Long-term N studies show that 20-50% of corn N comes...

How do I know if my soil is healthy and what are indicators of soil health ? Plants thrive in healthy soils and are not overtaken by pests (weeds, insects, diseases). Weeds are the first colonizers of unhealthy, compacted or newly formed soils. Usually something is missing (soil organic matter (SOM), a certain nutrient, soil too tight) and weeds thrive under these conditions until the condition improves. Insect and disease pest also thrive, because the plant is sick and easy prey. Just like the lion or wolf in the wild, the sick and weak are consumed. Healthy soils have deep loose soil for good root growth. The soil should be dark in color meaning that the soil has plenty of SOM. Healthy soil should be slightly moist, crumble, have soil aggregates that fall apart, and have an “earthy” smell. When it rains, the aggregates should stick together and not turn to mud. Soil that turns to mud in water is composed of mostly microaggregates. When microaggregates become sticky and clump together...

After a dry summer, the smell of rain is often refreshing but maybe a little less so to farmers at harvest time! People can often sense it is going to rain. This “pre-rain” smell comes from ozone formed when oxygen (O2) in the atmosphere is spilt through electrical charges in the clouds to form ozone (O3). Ozone is blown down from the upper atmosphere and has a sharp odor, somewhat like chlorine or burnt wires. This pre-rain smell is a good indication a storm is brewing before the pleasant smell of rain occurs. Recent research shows that the smell of rain is caused by soil actinomycetes or actinbacteria. Scientist have a name for it called petrichlor (pronounced pet-try-cure). As rain infiltrates the soil, it causes the actinomycetes to form spores which are released along with geosmin, a chemical that creates that earthy soil smell when soil is tilled. Geosmin and petrichlor are especially more intense in healthy soils, due to higher soil microbial activity. If a soil is unhealthy wit...

As harvest progresses, its not too late to plant cover crops, but the options are becoming more limited. Most cover crops need a minimum of 60 days of growth before cold freezing winter weather limits growth. Rape seed, kale, and cereal rye are three cover crop varieties that can be planted later than most cover crops that are cold sensitive. The key is getting them planted as soon as possible. Rape seed and kale are small seeded brassica cover crops that can be broadcast or drilled. The seeding rate is generally 3-5 pounds per acre by themselves, requiring a .25 to .5-inch seeding depth, and they emerge in 4-10 days. These two brassicas can germinate at 410 F and grow quite rapidly in the fall and can still be planted in late October. The biggest disadvantage to planting either rape seed or kale before corn is that they do not promote the beneficial mycorrhizal fungi in the soil, so farmers may see a 5-10 corn bushel decrease. Soybeans yield reductions generally are not a problem. Rap...

After a dry summer, reduced corn yields generally results in excess soil nitrogen (N) and excess N leaching in the fall, winter, and spring. Most farmers fertilize for maximum yields and hope that the weather cooperates. When corn yields are reduced due to drought, the excess N that was applied is often lost through leaching when the rains return or it may be lost to the atmosphere as ammonia gas under saturated soil conditions through denitrification. Soil N runoff is lost at 100X higher rates than soil phosphorus and N is a major pollutant in Lake Erie and the Mississippi River. Keeping nitrogen in the soil should be a major goal of every farmer, so keeping N in a form that is both plant available but not soluble would be a great accomplishment. Microbially bound N is both plant available but also not soluble. When soils get dry, N is often not plant available but when these soils finally get wet, the soluble N can be lost by leaching or denitrification. The best way to reduce these ...

Achieving higher grain yields requires a combination of good genetics with a good environment. The full genetic potential of many crops is severely limited by poor environmental conditions especially due to poor soil structure, too much or too little water, and the availability of essential nutrients. Research shows that wheat yields can be increased 50%-100% by improving the soil environment resulting in 2-3X higher root growth and 3-4X higher tillers, resulting in more upright plants for higher photosynthesis and wheat plants with less disease and insect pressure. Good soil health allows each wheat plant to maximize its yield potential. Several management factors that increase wheat yields include plant spacing (related to plant tillers), adequate aeration (oxygen), and high soil organic matter or compost. Wheat seed that is planted too close together inhibits root development and wheat tiller formation due to the competition for water and nutrients. For early wheat planting, close t...

Many farmers ask what is the value of planting cover crops on my farm? A common question with many answers. Cover crops have many benefits and uses, so the answer varies by farm field and farming operation. Cover crops have value even if yields do not immediately increase because they may reduce some pests (weeds, insects, diseases); decrease fertility costs; improve soil structure; decrease soil erosion and nutrient loss; and can be used for grazing or for forage. Many cover crop benefits accrue over time, so immediate changes may at first be difficult to see. One of the biggest benefits to cover crops is the addition of soil organic matter (SOM). Each 1% SOM addition is worth between $500 to $600 in soil fertility. A typical cover crop adds 0.1 to .15% SOM yearly valued at $50-90 per acre. Cover crops add roots and surface cover which greatly increases SOM and improves soil fertility. Calculations done by USDA-SARE in a Technical Bulletin: Cover Crop Economics (2019) show that cover ...

As summer winds down, gardeners and farmers are harvesting their crops. The dry weather has reduced yields but crops have a higher sugar content due to the concentration of plant sugars from less water. Drought has had a negative effect on both vegetative and reproductive growth. There are certain nutrients which promote mainly vegetative growth and others that promote reproductive growth. A basic understanding of these nutrient relationships can help homeowners, gardeners, and farmers maximize their harvest. Plants utilize nitrates (NO3 - ), potassium (K + ) and chloride (Cl - ) to promote vegetative growth. The plant growth hormone auxin is stimulated by these nutrients and is produced in the growing tips of plants and regulates cell growth and promotes cell elongation. Overfertilizing with these nutrients can lead to excess vegetative growth but no reproductive growth with no flowers or fruit. For example, to much nitrate in tomatoes cause lots of vegetative growth, but no or few to...

The 2020 Field Day for the Lenawee Center for Excellence in Adrian bas been replaced with a twilight tour Sept. 2, from 4:30 p.m. and run until 7:30. Due to COVID-19 restrictions, the tour will limit attendance to 100 participants. Pre-registration is required by calling the district office at 517-263-7400, Ext. 3. Due to COVID-19, state safety mandates will be in effect, including social distancing and wearing a mask. Persons should not attend if they are feeling ill or have been in contact with someone who has been sick. Location: Raymond & Stutzman Farms: 8055 Seneca Hwy., Morenci. Three concurrent sessions, each 30-35 minutes long, will run twice. Topics will include: Cover Crops for Soil Health by Jim Hoorman, Hoorman Soil Health Services. Planter clinic: Technology for Precision Planting & Nutrient Management— including John Deere, Josh Beaverson, Precision Ag Services and Case IH companies. Industrial Hemp Production in Michigan with speaker Theresa Hissong, a Farm Burea...

Late summer and early fall (August 1-Mid-September) is a great time to sow cover crops. Methods include broadcasting with an airplane, helicopter, high boy applicator, various types of spreaders OR seed incorporation with light tillage or a drill. Broadcast seeding rates need to be 10-20% higher and are highly dependent upon adequate moisture at planting. Incorporating or drilling the seed means sowing the cover crops after grain is harvested. Successful cover crop stands depends upon getting seed planted correctly. Using an airplane or even a helicopter is fast and economical. Airplanes have to avoid trees, telephone and power lines; so stands may be variable on the ends. Helicopters can hover but the whirling blades sometimes variably scatter the seed. In both methods, cover crop seed my end up in corn whorls or on neighboring fields. Broadcast seed can be eaten by voles, slugs, or earthworms which drag the seed down their burrows. Avoid broadcasting seed if the soil is excessively d...

Cover crops provide many species of wildlife with food and shelter. If you want to maximize wildlife benefits, avoid cover crop monocultures. Cover crop diversity and interspersion are keys to improving wildlife habitat. For birds like quail and pheasant; nesting, brood-rearing, and escape cover are critical for bird survival, and these three types of cover need to be within 40 yards of each other for best interspersion (Zac Eddy, Senior Wildlife Biologist). For birds, high energy grain cover crops provide food and shelter (structural cover). Good bird cover crops should include warm season forage species planted after wheat harvest. Sorghum species can grow 6-9 feet tall and they lodge in the winter, providing excellent cover and food for quail, pheasant, and rabbits; even under heavy snow and ice. Warm-season cover crops like sorghums, millets, sunflowers and warm-season legumes such as cowpeas and Sunn hemp can be planted. Sorghums, millets and sunflowers are excellent seed producer...

There are numerous beneficial insect species in the USA including 91,000 species of beetles (Order:Coleoptera), and many Hymenoptera or species of wasp (4,000), bees (4,000), and ants (1,000). Other beneficials include flies (5,500, Diptera), true bugs (3,800, Hemiptera), spiders (3,000, Arachnids) and earwigs (Dermaptera). Beneficials include immature ground beetles and lightning bugs, which consume soil insects and weed seed. The world insect population has declined 75% since the 1970’s, due to the overuse of insecticides, especially neonicotinoids seed treatments. Beneficial insects also pollinate USA agricultural crops worth an estimated $5 billion dollars per year and are predators to many harmful insects. There are three major ways to fight harmful insects: chemical insecticides, good plant nutrition from soil health, and by promoting insect predators. Insecticides generally kill everything including the beneficial insects that reduce harmful insect populations. Neonicotinoids (C...

Farmers are reporting crop damage from voles (field mice). Oval bare patches and burrows in soybeans or wheat fields indicate voles are present. Vole populations peak every 2-5 years. Cold harsh winters (2018, 2019) were the vole bottom and populations rebounded due to a mild 2020 winter. Snow and crop residue insulate voles against the cold. Voles do not hibernate but they need 40% more energy to survive cold winters. It is now time to view crop damage and to devise a plan to reduce vole damage next spring. Voles are 3-7 inches long, with short ears, small eyes, short tails, and brownish gray fur. There are two types of voles (meadow vole, prairie vole) that cause crop damage. Meadow and prairie voles are similar in appearance except prairie voles may have a yellow belly. Prairie voles’ mate for life and are normally seen in pairs, while meadow voles are usually alone. Highly prolific, meadow voles have 4-8+ litters per year, up to 11 young per litter under optimal conditions of food ...