标题：Precision Agriculture Practices Improves Soil Aggregation, Aggregate Associated Organic Carbon Fractions and Nutrient Dynamics in Cereal-based Systems of North-West India: An Overview
期刊名称：Current Journal of Applied Science and Technology
印刷版ISSN：2457-1024
出版年度：2020
卷号：39
期号：9
页码：40-53
DOI：10.9734/cjast/2020/v39i930605
语种：English
出版社：Sciencedomain International
摘要：Precision farming uses proximal and remote sensor surveys to delineate and track in-field variations in soil and crop attributes, directing variable input rate control, such that in-season management can be sensitive, e.g. matching strategic application of nitrogen fertilizer to site-specific conditions. It has the ability to increase productivity in the processing and use of nutrients, ensuring that nutrients do not leach out or accumulate in excessive amounts in areas of the field, causing environmental problems. Tillage systems can change the dynamics of organic carbon in soil and microbial biomass in soil by adjusting aggregate shape and distribution of C within aggregates. The effects of tillage on soil organic carbon (SOC) and soil aggregate nutrient content can differ spatially and temporarily, and for different types of soil and cropping systems. The maximum (19.2 percent) and minimum (8.9 percent) proportion of total aggregated carbon was retained in surface soil, with fractions of 2 mm and 0.1-0.05 mm size respectively. At a depth of 0-7 cm soil MBC under plowing tillage was slightly higher than rotary tillage, but EOC was just opposite. Rotary tillage had much higher soil TOC than plowing tillage at a depth of 7-14 cm. Nevertheless, under plowing tillage, TOC, DOC, and MBC were significantly higher than rotary tillage except for EOC, at 14-21 cm depth. A significant proportion of the total SOC was found to be captured under both surface (67.1 percent) and sub-surface layers (66.7 percent) by the macro-aggregates (2-0.25 mm), leaving rest in micro-aggregates and particles shaped as "silt + clay."
关键词：Aggregates;aggregate associated C and N;water soluble carbon;soil organic matter dynamics.
