Abstract

Finding a suitable method for estimating soil and crop specific potassium (K) bioavailability under variable range of soil fertility has been a mighty challenge. To undermine this, a field experiment was conducted under varying levels of fertilizer application on pre-established fertility gradient strips in the Indo-Gangetic plains of West Bengal, India for predicting crop response and to assess the K availability in winter growing broccoli by employing six acclaimed chemical extractants viz. ammonium bicarbonate-diethylenetriaminepentaacetic acid (AB-DTPA), calcium chloride (CaCl₂), Kelowna, Mehlich-III, ammonium acetate (NH₄OAc), and sodium tetraphenylborate (NaTPB₄). The availability study of K followed the pattern as, CaCl₂ < AB-DTPA < Kelowna < NH₄OAc < Mehlich-III < sodium tetraphenylborate (NaTPB₄). A higher extractability of K was envisaged under the conjoint application of higher doses of K fertilizers along with the organics. Among the extractants, NaTPB₄ showed the highest correlation sum (3.98) and also yielded a significant relationship with plant tissue K concentration (0.858) and uptake (0.715). The NaTPB₄, Mehlich-III, and NH₄OAc extractants were found to be significantly related to most of plant indices. The Euclidean distance based cluster analysis and linear regression study further proved the relatively higher efficiency of NaTPB₄ extractant followed by Mehlich-III and NH₄OAc to estimate plant K response in broccoli under the Gangetic alluvial soils of West Bengal, India.

抽象的

寻找合适的方法来估计土壤肥力变化范围内的土壤和农作物特定钾（K）生物利用度是一个巨大的挑战。为了消除这种情况，在印度西孟加拉邦印度恒河平原的预先设定的肥力梯度带上，在不同肥料用量下进行了田间试验，以预测作物的反应并通过采用六种方法评估西兰花在冬季生长中的钾素有效性。备受赞誉的化学提取剂。碳酸氢铵-二亚乙基三胺五乙酸（AB-DTPA），氯化钙（CaCl ₂），基洛纳（Kelowna），Mehlich-III，乙酸铵（NH ₄ OAc）和四苯基硼酸钠（NaTPB ₄）。钾的有效性研究遵循CaCl ₂模式<AB-DTPA <基洛纳<NH ₄ OAc <Mehlich-III <四苯基硼酸钠（NaTPB ₄）。设想在更高剂量的钾肥与有机物的联合施用下，钾的可萃取性更高。在萃取剂中，NaTPB ₄显示最高的相关总和（3.98），并且还与植物组织中的K浓度（0.858）和吸收（0.715）产生显着关系。发现NaTPB ₄，Mehlich-III和NH ₄ OAc萃取剂与大多数植物指标显着相关。基于欧氏距离的聚类分析和线性回归研究进一步证明了NaTPB ₄萃取剂相对较高的效率，其次是Mehlich-III和NH ₄OAc估计印度西孟加拉邦恒河冲积土壤下西兰花中植物K的响应。