The imbalanced use of chemical fertilizers under intensive cultivation practices over a period of years leads to various soil‐associated problems particularly nutrient availability. Thus, to examine the effect of long‐term application of balanced and imbalanced inorganic fertilizer and farm yard manure (FYM) application on the chemical fraction of DTPA‐extractable micronutrients under rice–wheat cropping system after 29 years, the observations were recorded from the ongoing field experiment at Govind Ballabh Pant University of Agriculture and Technology, Pantnagar, India. An application of balanced inorganic fertilizer with FYM in rice, while without FYM in wheat significantly improved the DTPA‐extractable Zn, Fe, Mn and Cu after rice and wheat crops in both the surface and sub‐surface soil layers. Lowest DTPA‐extractable Zn, Fe, Mn and Cu were recorded, in surface and sub‐surface soil under rice and wheat crops in control. The highest DTPA‐extractable Zn, in both surface and sub‐surface layers of rice (3.31, 1.62 mg kg⁻¹, respectively) and wheat (2.96, 0.99 mg kg⁻¹, respectively) was recorded because of application of N₁₈₀+P₈₀+K₄₀+Zn(F) + FYM in rice and N₁₈₀+P₈₀+K₄₀+Zn(F) in wheat. However, the DTPA‐extractable Fe, Mn and Cu were highest in rice and wheat because of N₁₂₀+P₄₀+K₄₀+FYM and N₁₂₀+P₄₀+K₄₀ application, respectively. The balanced use of inorganic fertilizer with FYM (N₁₈₀+P₈₀+K₄₀+Zn(F) + FYM) in rice and without FYM [N₁₈₀+P₈₀+K₄₀+Zn(F)] in wheat supported the highest rice (6.74 t ha⁻¹) and wheat (3.50 t ha⁻¹) grain yields, while lowest in control. Based on the study results, long‐term application of FYM at 5 tonnes ha⁻¹ in rice crop sustained the availability of DTPA‐extractable cationic micronutrients to rice and wheat in Mollisols.

中文翻译：

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长期平衡和不平衡无机肥和FYM施用对水稻-小麦种植系统下DTPA可提取微量营养素化学成分和产量的影响

多年来在精耕细作中化肥的不平衡使用导致了各种与土壤相关的问题，尤其是养分的可用性。因此，为了检查长期施用平衡和不平衡无机肥和农家肥 (FYM) 对 29 年后水稻 - 小麦种植系统下 DTPA 可提取微量营养素化学成分的影响，观察结果来自在印度潘特纳加尔戈文德巴拉布潘特农业科技大学正在进行的田间试验。在水稻中施用含 FYM 的平衡无机肥，而在小麦中施用不含 FYM 的平衡无机肥，显着提高了水稻和小麦作物后表层和次表层土壤中 DTPA 可提取的 Zn、Fe、Mn 和 Cu。最低 DTPA 可萃取的 Zn、Fe、在对照的水稻和小麦作物的表层和亚表层土壤中记录了 Mn 和 Cu。由于施用 N₁₈₀+P₈₀，在水稻（分别为 3.31、1.62 mg kg⁻¹）和小麦（分别为 2.96、0.99 mg kg⁻¹）的表层和亚表层中记录了水稻中的 +K₄₀+Zn(F) + FYM 和小麦中的 N₁₈₀+P₈₀+K₄₀+Zn(F)。然而，由于分别施用 N₁₂₀+P₄₀+K₄₀+FYM 和 N₁₂₀+P₄₀+K₄₀，DTPA 可提取的 Fe、Mn 和 Cu 在水稻和小麦中最高。在水稻中平衡使用无机肥料与 FYM (N₁₈₀+P₈₀+K₄₀+Zn(F) + FYM) 和不使用 FYM [N₁₈₀+P₈₀+K₄₀+Zn(F)] 在小麦中支持最高的水稻 (6.77 公顷)。 ¹) 和小麦 (3.50 t ha⁻¹) 谷物产量，而在对照中最低。根据研究结果，