“Biomass production and yield in irrigated maize at different rates of nitrogen in a semi-arid climate”

Q1 Agricultural and Biological Sciences

Njas-Wageningen Journal of Life Sciences Pub Date : 2020-12-01 DOI:10.1016/j.njas.2020.100321

H. López Córcoles , J.A. de Juan , M.R. Picornell

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引用次数: 4

Abstract

Nitrogen fertilization has a significant environmental impact in Europe due to the problems of wide-spread pollution. This paper deals with a series of field experiments conducted in a semiarid region of Southeast Spain. Irrigated maize was grown under different N fertilizer rates: control as in no nitrogen applied (C; 0 kg N ha^―1); conventional amount of nitrogen (Nc; 300 kg N ha^―1); and theoretical optimum (No; 130 kg N ha^―1) in a randomised block design with three replications.

In 1999 and 2000, when 175 and 150 kg N ha^―1 were respectively applied to No treatment, no significant differences were found. With the Nc treatment, a grain yield of 17.6 Mg ha^―1 was obtained in 2001, being significantly higher than the yield obtained with the No treatment (15.8 Mg ha^―1). This means that No rate was under the technical optimum, but both treatments were higher than C treatment (7.2 Mg ha^―1). A fertilizer rate of 130 kg N ha^―1 was lower than necessary to obtain maximum yields, although the rate of 150 kg N ha^―1 did not show significant differences with regard to Nc treatment (300 kg ha^―1) (2000).

Studies about crop response to different N rates could be very useful for farmers. Regional Technology Transfer Centres are incorporating the results of these studies in a Decision Support System (DSS).

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半干旱气候下不同施氮率下灌溉玉米的生物量生产和产量

由于广泛的污染问题，氮肥在欧洲对环境产生了重大影响。本文介绍了在西班牙东南部半干旱区进行的一系列田间试验。灌溉玉米在不同施氮量下生长:对照为不施氮(C;0 kg N ha-1);常规氮量(Nc;300 kg N ha-1);理论最优(No;130 kg N ha-1)，随机区组设计，3个重复。1999年和2000年，No处理分别施用175和150 kg N hm - 1，无显著差异。2001年Nc处理的籽粒产量为17.6 Mg ha-1，显著高于No处理(15.8 Mg ha-1)。这说明No处理在技术最优范围内，但均高于C处理(7.2 Mg ha-1)。130 kg N hm - 1的施肥量低于获得最大产量所需的施肥量，尽管150 kg N hm - 1的施肥量与Nc处理(300 kg hm - 1)没有显著差异(2000年)。研究作物对不同施氮量的反应对农民很有帮助。区域技术转让中心正在将这些研究的结果纳入决策支助系统。

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

Njas-Wageningen Journal of Life Sciences 农林科学-农业综合

自引率

0.00%

发文量

审稿时长

>36 weeks

期刊介绍： The NJAS - Wageningen Journal of Life Sciences, published since 1952, is the quarterly journal of the Royal Netherlands Society for Agricultural Sciences. NJAS aspires to be the main scientific platform for interdisciplinary and transdisciplinary research on complex and persistent problems in agricultural production, food and nutrition security and natural resource management. The societal and technical challenges in these domains require research integrating scientific disciplines and finding novel combinations of methodologies and conceptual frameworks. Moreover, the composite nature of these problems and challenges fits transdisciplinary research approaches embedded in constructive interactions with policy and practice and crossing the boundaries between science and society. Engaging with societal debate and creating decision space is an important task of research about the diverse impacts of novel agri-food technologies or policies. The international nature of food and nutrition security (e.g. global value chains, standardisation, trade), environmental problems (e.g. climate change or competing claims on natural resources), and risks related to agriculture (e.g. the spread of plant and animal diseases) challenges researchers to focus not only on lower levels of aggregation, but certainly to use interdisciplinary research to unravel linkages between scales or to analyse dynamics at higher levels of aggregation. NJAS recognises that the widely acknowledged need for interdisciplinary and transdisciplinary research, also increasingly expressed by policy makers and practitioners, needs a platform for creative researchers and out-of-the-box thinking in the domains of agriculture, food and environment. The journal aims to offer space for grounded, critical, and open discussions that advance the development and application of interdisciplinary and transdisciplinary research methodologies in the agricultural and life sciences.