IPI International Potash Institute
IPI International Potash Institute

研究报告: e-ifc No. 39, December 2014

巴西大豆一望无际。巴西Alvorada农场。照片拍摄:T. Wiendl

巴西费拉罗旗草作为免耕土地越冬覆盖物对钾素利用率及大豆产量的影响

Benites, V.M.(1), J.O. Caetano(2), W.C. Ferreira Filho(3), C.C.E. Menezes(3), J.C. Polidoro(1), R.P. Oliveira(1), and T. Wiendl(4)
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引言

(1)Embrapa Solos, R. Jardim Botânico 1024, Rio de Janeiro 22460-000, Brazil, vinicius.benites@embrapa.br; jose.polidoro@embrapa.br; ronaldo.oliveira@embrapa.br
(2)Department of Agronomy, Goias Federal University, c.p. 131, Goiânia GO 74001-970, Brazil, jeandercaetano@gmail.com
(3)Department of Agronomy, Rio Verde University, c.p. 104, Rio Verde GO 75901-970, Brazil, wandercruvinel@hotmail.com; carlos.menezes@comigo.com.br
(4)IPI拉丁美洲项目协调员,国际钾肥研究所(IPI), Switzerland, ipi@ipipotash.org 通讯作者: vinicius.benites@embrapa.br

巴西是世界上第三大钾肥消费国,钾肥的年消费量超过470万t K2O (ANDA, 2013),然而只有不到10%的钾肥由国内生产。绝大多数的钾肥用在粮食生产上,尤其是用在了大豆和玉米上,但是当土壤中大量的钾素被作物吸收带走后,为了保持土壤较高的生产力水平而再使钾素回复到大豆生产上显得尤为重要。巴西的粮食主产区土壤钾的储备量较低,如果补充钾素不充分,连续种植3-4季后作物产量会大幅下降,因此,非常有必要制定合理的管理措施来增加钾的利用率。旗草被认为有高的钾素循环利用率(ANDA, 2013)。本文我们调查研究了大田条件下旗草作为越冬覆盖物对高度风化的热带红壤土上大豆产量及钾的利用率带来的有利影响。

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