ABSTRACT

This field investigation was conducted to assess the implication of the direct and residual effect of the applied differential level of boron on the dynamics of the soil chemical properties, nutrient status in soil and yield of crops under cauliflower–cowpea-okra cropping sequence in an Inceptisol of North East India. The imposed treatments comprise five levels of boron viz., 0, 0.5, 1.0, 1.5 & 2.0 kg ha⁻¹ with four replications. To assess the direct effect of boron fertilization in soil, cauliflower crop was grown as a test crop. While for further assessment of concomitant residual effects of boron fertilization, cowpea and okra were grown as a test crop wherein boron fertilization was phased out in both the crops. The recommended dose of NPK fertilizer along with FYM was uniformly applied to all the crops in the cropping sequence. The experimental findings showed that amongst the applied differential levels of boron, application of 2 kg B ha⁻¹ was realized as the most prominent boron dose responsible for increasing the maximum content of soil chemical properties, nutrient status in soil and yield of crops while the control plots recorded the lowest for all the three crops in the sequence. Principal component analysis executed in respect of soil chemical properties and soil nutrient status in cauliflower-cowpea-okra sequence explained the data variation to the tune of 77.03%, 76.52% and 70.74% of the total variability. Similarly, multiple linear regressions performed to figure out the best fitting model showed that response variable potassium attributed the highest up to 52.05% in augmenting yield of cauliflower while nitrogen accounted for 72.04% in cowpea and zinc contributed 89.55% in okra, respectively. Overall, the present findings indicated thatapplication of 2 kg B ha^-1 was found to be the best treatment in improving the soil chemical properties, nutrient status in soil and yield of crops under cauliflower–cowpea- okra cropping sequence.

摘要

该田间调查旨在评估在Inceptisol中花椰菜-ca豆-秋葵的种植顺序，不同硼水平对土壤化学特性，土壤养分状况和农作物产量的动态影响具有直接和残留的影响。印度东北部。所施加的处理包括五种水平的硼，即0、0.5、1.0、1.5和2.0 kg ha ^-1有四个复制品。为了评估硼肥在土壤中的直接作用，种植了花椰菜作物作为试验作物。为了进一步评估硼肥的伴随残留效应，cow豆和秋葵作为试验作物进行种植，其中两种作物均已淘汰了硼肥。将NPK肥料的推荐剂量与FYM一起按种植顺序均匀施用于所有农作物。实验结果表明，在硼的不同施用量中，施用了2 kg B ha ^-1被认为是最突出的硼剂量，可增加土壤化学性质的最大含量，土壤中的养分状况和作物的产量，而对照样地记录的序列中所有三种作物的硼含量最低。对菜花-牛pea-秋葵序列中的土壤化学性质和土壤养分状况进行的主成分分析解释了数据变异至总变异性的77.03％，76.52％和70.74％。同样，进行多元线性回归以找出最佳拟合模型表明，响应变量钾在花椰菜增产中的比例最高，最高可达52.05％，而cow豆中的氮分别占72.04％，秋葵中的锌占89.55％。总体而言，本研究结果表明，施用2 kg B ha发现^-1 是改善花椰菜–秋葵-秋葵种植顺序下土壤化学特性，土壤养分状况和农作物产量的最佳方法。