Key Message

Nutrient uptake in the biomass of healthy and root (wilt) disease affected coconut palms are different.

Abstract

Root (wilt) is a predominant phytoplasmal disease affecting coconut (Cocos nucifera L.) palms and to sustain the palm health and productivity, better nutrient management practices are required. The objective of this research was to understand the uptake pattern and the partitioning of nutrients in the total biomass of healthy and root (wilt) diseased palms grown in humid tropical Entisol of Kerala. 5 coconut palms each were selected from diseased palms viz., Early (DE), Middle (DM) and Advanced (DA) category along with the control, which is Apparently Healthy palm (AH), without any diseases. The total biomass component with respect to each part viz., leaf (L), petiole (P), spadix (S), spathe (Sp), stem (St), leaf sheath fiber (LSF), husk (H) and nuts (copra:C + shell (Sh)) (N) were estimated. Nutrient uptake by the entire biomass uptake is classified as 1. Recyclable portion (L, P, S, Sp, H, LSF and Sh) 2. Removable portion (C) 3. Reserve biomass (St) and then computed the nutrient partitioning by standard analytical procedures. For all nutrients except Mg, reserve biomass had the greatest nutrient uptake followed by recyclable biomass and removable biomass components. Among the nutrients, potassium recorded the highest total uptake. In AH palm, the total uptake of potassium was 1075 g per palm, whereas it was 407.3 g per palm in the diseased palms. The total uptake of nutrients which showed a significant relation with disease index followed the order K > N > Ca > S > P > Mg in apparently healthy palms and N > K > Ca > S > P > Mg in diseased palms. The percentage reduction in total uptake of N, P, K, Ca, Mg, S and B by diseased palms in comparison with healthy palms was 36.5, 37.6, 57.5, 44.1 23.3, 43.7 and 48.9. The results of the study indicated that the pattern of nutrient uptake in the different biomass components of apparently healthy and root (wilt) disease affected palms are significantly different. This can instigate the formulation of appropriate nutrient management strategies in coconut with emphasis on its residue recycling potential.

中文翻译：

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在潮湿热带喀拉拉邦的Entisol中生长的健康和受根（野）病影响的椰子树中营养分配的比较评估

关键信息

健康椰子和受根（野）病影响的椰子的生物质中的营养吸收量不同。

抽象

根（枯萎）是影响椰子（Cocos nucifera L.）棕榈树的主要植物质体疾病，为了维持棕榈树的健康和生产力，需要更好的养分管理方法。这项研究的目的是了解在喀拉拉邦热带湿润Entisol中生长的健康和根（野）病棕榈的总生物量的吸收模式和养分分配。从患病的棕榈树中分别选出5棵椰子树，即早期（DE），中级（DM）和高级（DA）类别，以及对照，它们是没有任何疾病的表观健康棕榈（AH）。相对于每个部分的总生物量成分，即叶子（L），叶柄（P），茎秆（S），茎（Sp），茎（St），叶鞘纤维（LSF），果壳（H）和坚果（椰干：C +壳（S h））（N）的估计值。整个生物质吸收的养分吸收分类为1。可回收部分（L，P，S，Sp，H，LSF和S h）2.可移动部分（C）3.保留生物量（St），然后通过标准分析程序计算养分分配。对于除镁以外的所有养分，储备生物量的养分吸收量最大，其次是可循环利用的生物量和可移动生物量成分。在营养素中，钾的总摄入量最高。在AH棕榈中，钾的总摄入量为每棵棕榈1075 g，而患病的棕榈中钾的总摄入量为407.3 g。与健康指数显着相关的养分吸收总量，在看上去健康的棕榈树中遵循K> N> Ca> S> P> Mg的顺序，而在患病的棕榈树中N> K> Ca> S> P> Mg。与健康的手掌相比，患病的手掌对N，P，K，Ca，Mg，S和B的总摄入量减少的百分比为36.5、37.6、57.5、44.1、23.3、43.7和48.9。研究结果表明，显然健康的棕榈树和受到根（野）病影响的棕榈树不同生物量组分的养分吸收模式显着不同。这可以促使制定适当的养分管理策略，重点在于椰子残渣的回收潜力。