ABSTRACT For assessing the effect of boron fertilization on the micronutrient concentration in plants, its uptake in edible portion and crop yield in cauliflower–cowpea-okra cropping sequence in an Inceptisol of North East India field experiments were conducted during the year 2015–17 at Horticultural Experimental Farm, Assam Agricultural University, Jorhat. Five graded levels of boron were applied (0, 0.5, 1.0, 1.5, and 2.0 kg ha−1) to cauliflower once in both the years to assess the direct effect of boron fertilization in soil while cowpea and okra were grown as a succeeding test crops to study the concomitant residual effects of boron fertilization in cauliflower–cowpea-okra cropping sequence. Recommended dose of NPK fertilizer along with FYM for each crops were uniformly applied. Among the different levels of boron, experimental findings revealed that application of 2 kg B ha−1 was found prominent in augmenting the highest content of micronutrients in plant parts while the control recorded the lowest content for all the three crops in the sequence. A highly significant positive correlation between the different micronutrients content in edible portion of crops were recorded except copper. Similarly, application of 2 kg B ha−1 exhibited the highest micronutrient uptake in edible portion of crops, crop yield, crop equivalent yield, nutrient use efficiencies, and benefit cost ratio for all the crops in the sequence. Multivariate analysis (PCA) exercised on micronutrients content in edible portion of crops explained up to 97.19% of total variance with two principal components.

中文翻译：

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“受硼肥分级水平影响的花椰菜-豇豆-秋葵种植序列中植物微量营养素含量、吸收量和作物产量”

摘要 为了评估硼肥对植物中微量营养素浓度的影响，在 2015-17 年间在印度东北部的 Inceptisol 中进行了花椰菜 - 豇豆 - 秋葵种植序列中可食用部分的吸收和作物产量的田间试验。实验农场，阿萨姆农业大学，Jorhat。两年一次向花椰菜施用五个分级水平的硼（0、0.5、1.0、1.5 和 2.0 kg ha-1），以评估硼在土壤中施肥的直接影响，同时种植豇豆和秋葵作为后续试验作物研究硼肥在花椰菜-豇豆-秋葵种植顺序中的伴随残留效应。对每种作物均匀施用推荐剂量的 NPK 肥料和 FYM。在不同水平的硼中，实验结果表明，施用 2 kg B ha-1 可显着增加植物部分微量营养素的最高含量，而对照记录的所有三种作物的含量最低。除铜外，作物可食用部分不同微量营养素含量之间存在极显着的正相关关系。类似地，施用 2 kg B ha-1 表现出最高的微量营养素吸收在作物的可食用部分、作物产量、作物当量产量、养分利用效率和序列中所有作物的效益成本比中。对作物可食用部分微量营养素含量进行的多变量分析 (PCA) 解释了两个主要成分的总方差的 97.19%。