Phosphate fertilization and critical leaf phosphorus content for okra

Pub Date : 2023-06-01 DOI:10.1590/1983-21252023v36n225rc

Arilson de J. F. Souza, A. F. Wamser, Vitor B. da Silva, S. M. C. Nascimento, Leilson Costa Grangeiro, A. B. Cecílio Filho

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Abstract

ABSTRACT The objective of this study was to evaluate the growth and yield of okra as a function of phosphorus (P) doses and to obtain the critical leaf P content, under the edaphoclimatic conditions of Maranhão (MA), Brazil. The field experiment was carried out from February 15, 2017, to May 9, 2017, in São Luís, MA. The experimental design was randomized blocks, with four replications. The treatments were doses of 0, 80, 160, 240 and 320 kg ha-1 of P2O5, in the form of triple superphosphate, at planting, plus 10 t ha-1 of solid cattle manure. The increase of the P dose increased plant height, leaf dry mass and stem dry mass. With phosphorus supply, flowering occurred earlier than in plants without fertilization. Considering soils with low P content (P(resin) = 11 to 25 mg dm-3) and the minimum recommended organic fertilization for the okra crop of 10 t ha-1 of solid cattle manure, the maximum number of fruits, length of fruit and yield (9960.36 kg ha-1) were obtained with the fertilization of 80 kg ha-1 of P2O5, for the edaphoclimatic conditions of MA, Brazil. The critical leaf P content in okra is 3.4 g kg-1.

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磷肥与秋葵临界叶磷含量

摘要本研究旨在评价在巴西maranh (MA)土壤气候条件下秋葵生长和产量与磷(P)剂量的关系，并获得临界叶片P含量。野外试验于2017年2月15日至5月9日在马萨诸塞州 o Luís进行。试验设计为随机分组，4个重复。分别在种植时施用0、80、160、240和320 kg hm -1的P2O5，以三元过磷酸钙的形式，加上10 t hm -1的固体牛粪。P剂量的增加增加了植株高度、叶片干质量和茎干质量。有磷供应的植物开花时间比没有施肥的植物早。考虑到低磷含量土壤(P(树脂)= 11 ~ 25 mg dm-3)和固体牛粪10 t hm -1的秋葵作物推荐最低有机肥，在巴西MA的土壤气候条件下，施用80 kg hm -1的P2O5可获得最大的果实数量、果实长度和产量(9960.36 kg hm -1)。秋葵临界叶片磷含量为3.4 g kg-1。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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