Modelling and measurement of the effects of fertilizer‐N and crop residue incorporation on N‐dynamics in vegetable cropping
作者:
D.J. Greenwood,
C. Rahn,
A. Draycott,
L.V. Vaidyanathan,
C. Paterson,
期刊:
Soil Use and Management
(WILEY Available online 1996)
卷期:
Volume 12,
issue 1
页码: 13-24
ISSN:0266-0032
年代: 1996
DOI:10.1111/j.1475-2743.1996.tb00525.x
出版商: Blackwell Publishing Ltd
关键词: Nitrogen fertilizers;crop residues;incorporation;nitrogen;models;soil;brassica;Brussels sprouts;barley;cauliflowers;fertilizer requirements
数据来源: WILEY
摘要:
Abstract.An easy‐to‐use simulation model was developed with the aim of improving fertilizer practice when crop residues are incorporated instead of removed. It was tested against data from a well‐monitored N fertilizer experiment in which three successive brassica crops were grown followed by barley.Experimental findings included: (a) that fertilizer‐N greatly increased yield of 3 crops without increasing residual soil mineral‐N at harvest unless supply exceeded crop demand; (b) that, by contrast, fertilizer‐N increased both yield of and residual soil mineral‐N left by the remaining crop throughout the range of applications; and (c) that at each harvest the apparent disappearance of fertilizer‐N by immobilization and other processes was almost proportional to fertilizer‐N. These phenomena were simulated by the model.Overall the model gave estimates of soil mineral‐N, plant weight and % N in the crop for each crop that were either in close agreement with or linearly related to the measured values. Deviations from this pattern are shown to result almost entirely from experimental error. In addition the model gave simulations of the time course of soil mineral‐N and soil water that were in good agreement with measurement.Simulations with the model indicate that appreciable benefits from residue incorporation of crops will only be obtained when fertilizer‐N is also applied, unless plant mass
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