ABSTRACT

Sustainability of cereal-based cropping system is important for the livelihood and food security in semi-arid regions. The present study explores the impact of long-term organic and inorganic nutrients and integrated fertilization practices of soil test crop response (STCR) approach of inductive-cum-targeted yield model on soil physical properties and its correlation with soil organic carbon (OC) under pearl millet–wheat in sandy-loam soils of semiarid north-west regions of India. Results showed that OC in the soils significantly increased in farm yard manure (FYM) and integrated treatments up to a maximum of 135% and 148%, respectively, in a period of 8 years over the control in surface soils (0–15 cm). The increase in OC significantly increased the infiltration rate (IR), hydraulic conductivity (HC), soil water retention at all suctions, water stable aggregates (WSA) (> 0.25 mm) and mean weight diameter of the soil aggregates, while decreased the bulk density (BD) and penetration resistance (PR) both at surface and subsurface soil layers. Soil OC also showed a negative correlation with BD (r = −0.955) and PR (r = −0.820). The hydraulic properties of the soil, viz., soil water retention, showed a high positive correlation with field capacity (r = 0.973), 0.922 for permanent wilting point (r = 0.922), HC (r = 0.938), IR (r = 0.973), and WSA (r = 0.979) with OC. Thus, long-term application of organic material in conjunction with NP improved soil physical health, provided better environment to grow crops through improved nutrient concentration and its translocation that ultimately helps to achieve yield target through STCR (Soil Test Crop Response) approach of inductive-cum-targeted yield model.

摘要

以谷物为基础的种植系统的可持续性对于半干旱地区的生计和粮食安全非常重要。本研究探讨了长期有机和无机养分和综合施肥实践的土壤测试作物响应（STCR）方法的感应兼目标产量模型对土壤物理性质的影响及其与土壤有机碳（OC）的相关性。印度西北部半干旱地区沙壤土中的珍珠粟-小麦。结果表明，与表层土壤（0-15 cm）相比，农家肥（FYM）和综合处理的土壤有机碳含量在 8 年内显着增加，最高分别达到 135% 和 148%。 . OC 的增加显着增加了入渗速率 (IR)、导水率 (HC)、所有吸力下的土壤保水量，水稳定团聚体 (WSA) (> 0.25 mm) 和土壤团聚体的平均重量直径，同时降低了表层和地下土壤层的容重 (BD) 和渗透阻力 (PR)。土壤 OC 也与 BD (r = -0.955) 和 PR (r = -0.820) 呈负相关。土壤的水力特性，即土壤保水性，与田间持水量呈高度正相关（r = 0.973），永久枯萎点为 0.922（r = 0.922），HC（r = 0.938），IR（r = 0.973) 和 WSA (r = 0.979) 与 OC。因此，长期施用有机材料与 NP 一起改善了土壤的物理健康，