IPI International Potash Institute
IPI International Potash Institute

研究报告: e-ifc No. 42, September 2015

Sukadana site, East Lampung, Indonesia. Photo by A. Taufiq.

在印度尼西亚酸性旱地上施用钾肥对木薯(Manihot esculenta Crantz)的影响

Taufiq, A.(1)(1a), Subandi(1), and H. Suyamto(1)
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摘要

(1) 印度尼西亚豆科和块茎作物研究所。Jl. Raya Kendalpayak km 8, PO Box 66, Malang 65101 East Java, Indonesia
(1a) 通讯作者:ofic_rilet@yahoo.com
注:国际钾肥研究所感谢前东南亚项目协调员Mr. Alexey Shcherbakov对这个项目的大力支持。

印度尼西亚的楠榜(Lampung)地区是主要的木薯生产地。该地区的土壤呈酸性,阳离子交换量(CEC)非常低,有机质含量更少,甚至可忽略不计。在这种土壤条件下假定钾(K)的可用性对木薯种植是一个限制因素,从木薯种植后15天开始,按序每次施用6个不同剂量的钾肥(0、30、60、90、120和180 kg K2O ha-1),另外再设一个农民的常规施肥作为对照,试验在Sukadana和Rumbia在两个地点同时进行。除了一个处理施用200 kg N ha-1和60 kg P2O5 ha-1外,所有的钾肥处理结合施用135 kg N ha-1和36 kg P2O5 ha-1。氮磷钾肥分别选用尿素(46% N)、SP36(36 kg P2O5)和氯化钾(60% K2O)。然而在收获时发现,不同的钾肥施用量几乎没有影响到土壤属性,但是它们能明显的影响植物生长、植物组织器官中钾的含量,以及块茎产量。在Sukadana,60-90 g K2O ha-1是最佳钾肥施用量,基本能满足木薯对钾的需求。而在Rumbia,最佳钾肥施用量却稍高。然而,一些证据表明,在该地区施用钾肥及其他手段来提高木薯生产的潜力是相当高的。对一些措施,如所施钾肥随作物的生长季分多次施用,补充有机堆肥来提高土壤肥力和木薯作物产量进行了讨论。

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