Abstract

The present field study was conducted on loamy sand soil at the Research Farm, Department of Soil Science, Punjab Agricultural University, Ludhiana, India under a rice–wheat cropping system to study the influence of long-term integrated nutrient management (INM) involving chemical fertilizers and organic amendments viz. farmyard manure (FYM), green manure (GM), and straw incorporation (SI) on the availability of micronutrients (Zn, Fe, Mn and Cu), yield and uptake of nutrients by crop in rice–wheat system. The experiment comprised 9 treatment combinations comprising control, 50% RDF (Recommended dose of fertilizer)+FYM, 50% RDF + GM, 100% RDF, 100% RDF (P to wheat), 100% RDF + FYM, 100% RDF + GM, 100% RDF + SI and 150% RDF. Results revealed that continuous use of chemical fertilizers along with organic amendments in rice–wheat cropping system (RWCS) for 19 years has resulted to an increase in the availability of micronutrient cations (Zn, Fe, Mn and Cu). Build-up of soil organic carbon and decrease in soil pH has resulted in the increase of bio-available forms of micronutrients. The transfer coefficient (TC) value did not vary significantly among the treatments except for Cu in both rice and wheat crop. Low soil recovery coefficient (SRC) values of Zn, Cu, Fe, and Mn indicated that long-term INM can meet their plant nutritional requirement in rice–wheat cropping system. This study concludes that long-term integration of FYM with NPK fertilizers has an edge over GM and SI in regulating the supply of micronutrients in soil–plant system and correcting the micronutrients deficiencies in rice–wheat cropping system.

摘要

本田间研究是在印度卢迪亚纳旁遮普农业大学土壤科学系研究农场在水稻 - 小麦种植系统下对壤质沙土进行的，以研究长期综合养分管理 (INM) 的影响，涉及化学肥料和有机改良剂，即。农家肥 (FYM)、绿肥 (GM) 和秸秆掺入 (SI) 对微量营养素（锌、铁、锰和铜）的可用性、产量和水稻-小麦系统作物对养分吸收的影响。实验包括 9 个处理组合，包括对照、50% RDF（推荐肥料剂量）+FYM、50% RDF + GM、100% RDF、100% RDF（对小麦的磷）、100% RDF + FYM、100% RDF + GM、100% RDF + SI 和 150% RDF。结果表明，在稻麦种植系统 (RWCS) 中连续使用化肥和有机添加物 19 年已导致微量营养素阳离子（锌、铁、锰和铜）的可用性增加。土壤有机碳的积累和土壤 pH 值的降低导致微量营养素的生物可利用形式增加。除了铜，水稻和小麦作物的转移系数（TC）值在不同处理之间没有显着差异。Zn、Cu、Fe 和 Mn 的低土壤恢复系数 (SRC) 值表明长期 INM 可以满足其在稻麦种植系统中的植物营养需求。