Irrigation management, light interception, and nitrogen in Tanzania grass cultivation

IF 0.9 4区农林科学 Q3 AGRONOMY

Revista Caatinga Pub Date : 2023-01-01 DOI:10.1590/1983-21252023v36n413rc

Danielle F. Cajá, Rosilene A. da Silva, Arthur A. S. de Oliveira, Adriana da S. Santos, Marcio G. da S. Bezerra, Francisco V. da S. Sá

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Abstract

ABSTRACT Management of nitrogen fertilization and light interception of pastures contributes to forage production in regions with low water availability. Therefore, the objective was to evaluate the effect of different nitrogen doses and light interception levels on the growth of Panicum maximum cv. Tanzania under different irrigation managements. The experiment was carried out in a greenhouse, using a factorial scheme (5 x 2 x 2), corresponding to five irrigation depths (40, 60, 80, 100, and 120% of actual evapotranspiration), two canopy light interception levels (90 and 95%), and two nitrogen doses (300 and 600 kg N ha-1 year-1). The highest biomass production occurs under irrigation with 120% of evapotranspiration. However, the best structural characteristics (tillering and number of leaves) occur with 100% of evapotranspiration, regardless of nitrogen dose and light interception level. Interruption of growth with 95% of incident light and fertilization with 600 kg N ha-1 year-1 promoted greater tillering, number of leaves and leaf length, regardless of the irrigation level. Tanzania grass management with an interruption of growth with 95% of incident light, 600 kg N ha-1 year-1, and irrigation with 80% of actual evapotranspiration led to tillering and number of leaves only 11% lower than the values found in the other treatments irrigated with 100% of actual evapotranspiration. Interruption of growth with 95% of incident light and fertilization with 600 kg N ha-1 year-1 improve the performance of Tanzania grass under deficit irrigation.

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坦桑尼亚草地种植的灌溉管理、截光和氮肥

氮肥管理和牧场截光有助于低水分地区的饲料生产。因此，本试验旨在评价不同氮素剂量和光照截留水平对白头翁生长的影响。坦桑尼亚不同的灌溉管理方式。试验在温室中进行，采用因子方案(5 × 2 × 2)，对应5个灌溉深度(实际蒸散量的40、60、80、100和120%)，2个冠层截光水平(90和95%)和2个氮肥剂量(300和600 kg N hm -1 -1)。灌溉条件下生物量产量最高，为蒸散量的120%。然而，在蒸散量为100%时，无论施氮量和截光水平如何，其结构特征(分蘖和叶数)最好。不论灌溉水平如何，以95%的入射光中断生长和600 kg N / h -1年-1施肥均能促进分蘖、叶数和叶长增加。在坦桑尼亚，以95%的入射光中断生长，600 kg N / ha-1年-1，以80%的实际蒸散量灌溉的草地管理，分蘖和叶片数量仅比以100%的实际蒸散量灌溉的其他处理低11%。以95%的入射光中断生长和600 kg N / ha-1年-1施肥可改善亏缺灌溉条件下坦桑尼亚草的生长性能。

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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来源期刊

Revista Caatinga AGRONOMY-

CiteScore

2.10

自引率

11.10%

发文量

审稿时长

6-12 weeks

期刊介绍： A Revista Caatinga é uma publicação científica que apresenta periodicidade trimestral, publicada pela Pró-Reitoria de Pesquisa e Pós-Graduação da Universidade Federal Rural do Semi-Árido – UFERSA, desde 1976. Objetiva proporcionar à comunidade científica, publicações de alto nível nas áreas de Ciências Agrárias e Recursos Naturais, disponibilizando, integral e gratuitamente, resultados relevantes das pesquisas publicadas.