Growth and yield of sweet potato in response to the application of nitrogen rates and paclobutrazol

IF 1.2 4区 农林科学 Q2 AGRICULTURE, MULTIDISCIPLINARY Bragantia Pub Date : 2021-06-21 DOI:10.1590/1678-4499.20200447
N. P. Ribeiro, A. M. Fernandes, R. M. Silva, R. A. Pelvine, N. S. Assunção
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引用次数: 1

Abstract

ABSTRACT The excess of nitrogen (N) causes the overgrowth of sweet potato foliage, increasing the self-shading and reducing the root yield. Therefore, a combined N and paclobutrazol (PBZ) application can reduce the vegetative overgrowth and benefit the sweet potato yield. The purpose of this study was to evaluate the plant growth, yield, uptake and removal of N by sweet potato plants fertilized with N and treated with PBZ during two planting seasons. The treatments consisted of four N rates (0, 50, 100 and 200 kg·ha–1), three forms of PBZ application (PBZ-10: PBZ applied at 10 days after side-dressing N fertilization [DASNF]; PBZ-25: PBZ applied at 25 DASNF, and PBZ-10 + 25: PBZ applied at 10 plus 25 DASNF), and a control (without PBZ application). Paclobutrazol application temporarily reduced the length of the main branches of sweet potato planted in the rainy season, but it did not reduce the shoot biomass of plants in both planting seasons. A single application of PBZ at 10 DASNF increased the yield of fresh storage roots in the two planting seasons, but, during the rainy season, the increases were greater when two applications were carried out. The application of 50 kg·ha–1 N in the rainy season was sufficient to reach the maximum yield of fresh storage roots, but, in the dry season, the N fertilization increased the N uptake without benefiting the root yield.
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施氮量和多效唑对甘薯生长和产量的影响
氮素过量导致甘薯叶片过度生长,增加了自遮阳,降低了根系产量。因此,氮素与多效唑(PBZ)配施可以减少甘薯的营养过度生长,有利于产量的提高。本研究旨在评价施氮和PBZ处理对两个种植季甘薯植株生长、产量、氮吸收和氮去除的影响。4种施氮量(0、50、100和200 kg·ha-1), 3种不同施氮方式(PBZ-10:在侧施氮后10 d施PBZ [DASNF];PBZ-25:在25 DASNF下使用的PBZ, PBZ-10 + 25:在10 + 25 DASNF下使用的PBZ),和一个对照组(不使用PBZ)。施用多效唑可使雨季种植的甘薯主枝长度暂时缩短,但在两个种植季节均未减少植株的地上部生物量。在两个种植季节,以10 DASNF单次施用PBZ可增加鲜储根的产量,但在雨季,两次施用时增加的量更大。雨季施氮50 kg·hm - 1足以达到鲜储根的最大产量,但在旱季,施氮增加了氮的吸收,但对根系产量没有好处。
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来源期刊
Bragantia
Bragantia AGRICULTURE, MULTIDISCIPLINARY-
CiteScore
2.40
自引率
8.30%
发文量
33
审稿时长
4 weeks
期刊介绍: Bragantia é uma revista de ciências agronômicas editada pelo Instituto Agronômico da Agência Paulista de Tecnologia dos Agronegócios, da Secretaria de Agricultura e Abastecimento do Estado de São Paulo, com o objetivo de publicar trabalhos científicos originais que contribuam para o desenvolvimento das ciências agronômicas. A revista é publicada desde 1941, tornando-se semestral em 1984, quadrimestral em 2001 e trimestral em 2005. É filiada à Associação Brasileira de Editores Científicos (ABEC).
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