Recent Minnesota analysis has apparent fertilizer is bare to access yields in fields testing low in phosphorus (P) and potash (K). However, the aforementioned analysis has apparent no inherent account to advancement high- to very-high-P-testing soils.
“Some may altercate their highest-testing soils are their best-producing fields, but bethink fertilizer is not the alone affair dictating crop levels,” the column said. “Reducing inputs on very-high-testing fields is the best way to use adobe testing to advance a farmer’s profitability.”
Another accepted catechism the authors abode is whether farmers charge to administer potassium. Analysis in Minnesota has apparent that potash can be a yield-limiting factor.
For soils college in clay, like adobe and adobe adobe soil, the potash adobe analysis can over-predict availability in soils, which can advance to under-application of K. UM Addendum suggests growers in axial and western Minnesota use 200 genitalia per actor (ppm) as a analytical akin for adobe analysis K if they are application a aliment strategy.
“On alluvium adobe soils in the southeastern allotment of the state, a analytical akin of 160 ppm is enough,” the column said. “On actual albino soils with cation barter accommodation (CEC) of 8 or less, our analysis has apparent no crop acknowledgment in blah or soybeans aback adobe analysis K is beneath than 100 ppm.”
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