Shifting crop-pasture rotations to no-till annual cropping reduces soil quality and wheat yield

摘要: Abstract When crop-pasture rotations are converted to continuous no-till annual cropping systems, the grain yield of wheat crops in rotation stagnates or declines response number years (YCC). We studied soil properties underlining YCC 80 on-farm trials during three growing seasons. determined frontier and gap under limited ( Y F − , best technical means) unlimited nutrient supply + supplemental additions nitrogen, phosphorus, potassium sulfur). For each field, we assessed quality based on organic carbon (SOC), phosphorus (Bray I), texture, field water infiltration rate (INF), potentially mineralizable nitrogen (PMN). also calculated a climatological index (CI) that combines temperature, radiation precipitation both spike early growth phases. estimated using stochastic production functions with CI, as predictor variables. The after perennial pasture were 6.9 8.4 Mg ha−1, 1.5 Mg ha−1 attributable limitations. However, while declined by 0.12 Mg ha−1 y−1 from YCC = 1 10 (P ≤ 0.05), stayed at roughly same level till YCC = 5, declining thereafter 0.17 Mg ha−1 y−1 (P ≤ 0.05). Reduced capacity, partially quantified PMN amendable fertilization, first five pasture. subsequent decline could not be compensated increased supply. After years, between for YCC = 10, 2.6 Mg ha−1. Up 40% this was explained deterioration independent supply; INF. Thus, generated progressive increase associated corrected fertilization only pasture, but thereafter, when physical seemed degrade past threshold reduced use efficiency.