ABSTRACT

Agroecosystem functioning is dependent on practices that improves not only crop productivity but also soil quality. Therefore, identification of appropriate agricultural management strategies is a viable option. The objective of the current study was to assess the changes in pertinent soil quality indicators and their influence on crop productivity through crop residue (CR) retention and potassium (K) management under zero tillage maize-wheat cropping system. The experiment was initiated during 2013 and consisted of four CR levels (0, 2, 4, and 6 Mg ha⁻¹) and five K levels (0, 50%, 100%, 150% RDK [recommended dose of K] and 50%RDK+Potassium solubilizing bacteria, KSB). Crop residue and K management significantly increased root-associated parameters with the application of 6–4 Mg ha⁻¹CR, 50%RDK+KSB. Changes in soil aggregate stability, available nutrient status, soil organic carbon (SOC)mass, SOCstock, microbial activities, plant nutrient uptake, and biomass yield were found significant with 6–4 Mg ha⁻¹ CR and 50% RDK+KSB. This is inconsonance with correlation study carried out. Therefore, it was concluded that the crop residue retention (6 and 4 Mg ha⁻¹) and reduction of inorganic K fertilizer by 50% and seed inoculation with KSB improved soil quality indicators, root parameters, and productivity of maize-wheat under zero tillage agricultural practices.

摘要

农业生态系统的功能依赖于不仅提高作物生产率而且提高土壤质量的实践。因此，确定适当的农业管理策略是一个可行的选择。本研究的目的是评估零耕作玉米-小麦种植系统下相关土壤质量指标的变化及其对作物残留（CR）保留和钾（K）管理对作物生产力的影响。该实验始于2013年，包括四个CR水平（0、2、4和6 Mg ha ^-1）和五个K水平（0、50％，100％，150％RDK [推荐的K剂量]和50 ％RDK +增溶钾的细菌，KSB）。施用6–4 Mg ha ^-1时，作物残留量和钾肥管理显着增加了根系相关参数CR，50％RDK + KSB。在6–4 Mg ha ^-1 CR和50％RDK + KSB下，发现土壤团聚体稳定性，可用养分状况，土壤有机碳（SOC）质量，SOC储量，微生物活性，植物养分吸收和生物量产量的变化显着。这与进行的相关研究不一致。因此，得出的结论是，在零耕作下，作物残留量（6和4 Mg ha ^-1）和无机钾肥减少50％以及接种KSB可以改善土壤质量指标，根系参数和玉米小麦的生产力农业实践。