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Is Recharge Worth It?Resourceful nutrient balance -
GRDC growers notes — for northern farmers. Nutrient removal Feb 3, Uncategorised. Agronomy Topic. No soil has an infinite amount of nutrients, and continued farming will eventually exhaust one or more of the plant-available nutrients in the soil. When this occurs yields and productivity will decline.
Fertiliser Use Efficiency — Get the most from your nutrition program. A BioAg Representative will discuss with you how you can improve fertiliser use efficiency. To read more on nutrient use efficiency, the benefit of BioAg Programs and nutrient removal refer to: BioAg White Paper — Nutrient use efficiency GRDC growers notes — Nitrogen Reference Manual for Southern Cropping GRDC growers notes — for northern farmers.
Search for:. Recent Posts BioAg in the field Impactful results even in challenging seasons Just a Trace — Micro in nature, but MIGHTY in impact. Distributor Spotlight — Ag Warehouse Bega What Rock Phosphate really Rocks? Stopping or reducing tillage begins to reverse these trends.
Adding microbial inoculants is generally unncessary. Organism diversity and abundance are seldom the problem. Typically food, water, or shelter are much more limiting.
If food or water are limiting, the organisms will die soon after application. In semiarid and arid regions, water, and not food, is the limiting factor to organism activity biology. In no-till production, wheat, corn, and sorghum residues may persist on the soil surface with little decomposition for 2 to 3 years because there is not enough precipitation to allow biological activity on the soil surface to decompose plant residues.
Biological activity in such soils occurs in short bursts when soil water is available. This reduces the disturbance to earthworm channels, and decreases the destruction of aggregates, leaving organisms less exposed to ambient environmental conditions.
More food is available for biological organisms. The biology followed, and nutrient availability will follow as soil organic matter increases. In fact, when soil salinity levels are high enough, only halophytes can survive; other organisms die.
Soil pH determines which microbes will be more abundant and active; organisms have little effect on soil pH. I knew that statement would get sticky with the chemistry folks.
Soil biology is absolutely responsible for soil structure. Reducing tillage and adding plant roots is doing what? Adding inoculants speeds up the process. They will come in time but the slow process will test your patience. We make things too hard on ourselves.
It is what it is in that case. If you want it to support something other than halophytes your going to have to manage it accordingly high animal impact and organic matter inputs. Organic matter can bind salts. But if the incoming salt stream is too high there not a lot you can do about it even with tons of inputs.
Chuck, I agree with you in general, but disagree on the sequence and goal. Additionally, there are three points that should be clarified.
Soil texture is the relative proportion of sand, silt, and clay, by definition. Biology has no influence on soil texture, it merely interacts with it to enhance or develop structure.
Cover crops and other practices that enhance soil biology are impotent in some regions , if tillage continues. Soil structure will not recover in those areas as long as tillage continues, no matter what happens with biological activity.
On cover and why practice no-till without planting cover crops: In the western Great Plains and the Southern High Plains, precipitation is less than 20 inches per year. Lake evaporation may be 80 to inches per year.
When converted to evapotranspiration, the plants want 4 to 5 times as much water as they receive in precipitation. It is not possible to grow an annual crop on growing-season precipitation alone.
Fallow is practiced to increase soil water storage because it is possible to grow a crop on growing season precipitation plus stored soil water. No-till in these climates increases soil water storage. Water moisture IS the limiting factor. People in this region are not having favorable results with cover crops.
If you are interested, the American Society of Agronomy is having a webinar series on Cover Crops in the Western Great Plains next month, noon to 1 p.
Each webinar will feature a researcher and a producer from the region to talk about principles and application. I worked in a soil testing lab for 5 years much of which focused on PSA Particle size analysis. It may be a matter of semantics when you consider the lab vs. real life. Real life vs.
But there are some in eastern CO and western KS that are making it work. Just a thought. Chuck, There was an journal article from the 80s that addressed true vs.
natural texture, given that pre-treatments remove organic matter and carbonates prior to particle size analysis for texture determinations. My argument is biology affects the behavior of those particles in forming and altering structure.
There are also producers and researchers in those same areas of Colorado and Kansas that are trying to make it work without success. Farmers that have not gone to no-till production lose much water to evaporation during the fallow period, and are finding benefits to cover crops, as the cover crops use the water that would otherwise be lost.
I agree that the most ecologically-friendly agricultural systems in those regions of Colorado, New Mexico, Texas, Kansas, and Wyoming are integrated crop-livestock systems. Those systems are not as economically lucrative, but will become more common as irrigation water becomes more limiting.
Contrary to the discussion, there are success stories from Eastern Colorado and western Kansas using cover crops. It will take time to figure out what went wrong and what worked. Do not automatically write off cover crops in our arid areas. Now to upset more people. Some of the best work in cover crops has come from farmers and ranchers, not research stations.
Or from Ag scientists. This concept has been proven with pasture and range grazing management. The soil balancing folks will say the general prescription loses its applicability with higher or lower CEC soils.
If nothing else, I like it because it is an alternative to narrow, conventional methods- and we can always use more of those. Putting blinders on and following one methodology is a sure way to get into trouble, be it soil balancing, NPK, whatever.
Thanks for the article and follow-up comments. At least we can all agree organic matter and soil biology fix everything. Well, I guess there are people that might disagree with that too! However, I do believe that added calcium and sometimes magnesium to soils can make a difference in yield and forage quality in some situations, even when pH is adequate, and there is a study that I mention below that suggests the same thing.
First, though, Univ. of Wisc. research trials showed that varying the ratios made no difference in forage yield. Yet, I knew both of the two researchers and they were both vehemently against soil balancing or the idea that soils that had adequate pH might benefit from added calcium or magnesium.
Was there bias in their research? Maybe, maybe not. Even my local extension agent, who was no fan of Midwestern Bio-Ag, or of soil balancing, was embarrassed by the poor quality of the study. The only thing they managed to demonstrate was how a biased group of researchers could alter the outcome of any study.
Again, I would suggest that some soils seem to benefit from applications of calcium and magnesium even when the soil tests suggest that there are sufficient amounts.
The local technical college teachers who work with farmers, both of whom have over 30 years of experience, are now big believers, because so many farmers have showed them improvements in forage quality when they used applications of calcium, even when pH was sufficient.
Also, not all research or researchers would agree with your opinion…and lets not forget that accepted beliefs, even those of scientists, are still merely opinions.
As an example, almost the whole scientific community fooled themselves for decades about the role of saturated fat in our diets, and are now, finally, reversing their opinions.
The cost of the treatment was relatively high, but it payed off with the improved yield and quality. Soil biology is everything, period. Soil organic matter SOM is the universal buffer pH, nutrients, moisture, etc.
Trying not to be absolute, virtually all soils already have the mineral nutrients needed for plant growth. What most agricultural soils are missing is the soil biology to make those nutrients available. The dominant element in most mineral soils is Silicon. But in many ag soils there is a positive growth response when we add silica.
Do we really another expensive input when that mineral is already there albeit an unavailable form? How do we make it available? Yup, soil biology, specifically fungi. Having said that, in extreme situations of salinity or acidity, gypsum or lime can help jump start that system back towards a healthy biology but you have to focus on getting the biology back.
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