Selection of a Suitable Extractant for Sequential Leaching of Soil to Evaluate Medium-Term Potassium Availability to Plants

Journal of Soil Science and Plant Nutrition(2024)SCI 3区

ICAR-Indian Agricultural Research Institute | ICAR-National Rice Research Institute | Department of Soil Science and Agricultural Chemistry | ICAR-Indian Agricultural Statistics Research Institute

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Abstract
Purpose The study aimed to select an extractant for assessing medium-term potassium (K) availability in Indian soils under controlled environment. Methods Potassium was extracted from five different Indian soils (alkaline alluvial, acidic alluvial, calcareous alluvial, red, and black) with ten successive leachings (18 h of incubation in each) using twelve 0.1 N solutions (acetic acid, hydrochloric acid, acetates, and chlorides of ammonium, sodium, magnesium, calcium and barium). A pot experiment was also conducted taking five crops of sorghum-Sudan grass hybrid. Kinetic equations were fitted to the cumulative K-released by different extractants. Path analysis was performed to comprehend the effect of soil parameters on initial and overall K-release constants, obtained from the best fitted kinetic model. Stepwise multiple-regression was performed to quantify medium-term K-availability based on important soil parameters. Results Total K-leached by barium chloride (BaCl 2 ) showed highest correlation (r 2 = 0.76; P < 0.01) with the cumulative K-uptake of 5 crops. The K-release by BaCl 2 was best explained by the parabolic diffusion equation. Initial K-release constant ( a pd ) was directly influenced by the water soluble-K and cation exchange capacity; while, overall K-release coefficient ( b pd ) was directly governed by both water soluble-K and exchangeable-K. Conclusions 0.1 N BaCl 2 emerged as the best among the twelve extractants for the assessment of medium-term plant K availability through sequential leaching in five major soils of India. The soil properties and K fractions had different influence on initial and overall rate constants of K release from the soils.
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Key words
BaCl2,Medium-term K-availability,Path analysis,Potassium leaching,Release kinetics
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要点】:本研究旨在筛选出适合评估印度土壤中植物中期限钾可用性的提取剂,发现0.1 N氯化钡是最佳提取剂,其与植物钾吸收的相关性最高。

方法】:通过十二种0.1 N溶液(包括醋酸、盐酸、醋酸盐和氯化物等)对五种印度土壤进行连续十次浸提(每次18小时孵化)来提取钾。

实验】:进行了一个盆栽实验,种植了五种高粱-苏丹草杂交作物,使用氯化钡作为提取剂得到的钾释放数据与作物钾吸收相关性最高,数据集名称未在文中提及。通过拟合动力学方程分析不同提取剂释放的钾,并进行路径分析以理解土壤参数对钾释放常数的影响,使用逐步多元回归分析基于土壤参数量化中期限钾可用性。