A MODEL TO PREDICT CHANGES IN SOIL-MOISTURE, NO3-N CONTENT AND N-UPTAKE BY WHEAT

被引：8

作者：

BENBI, DK

PRIHAR, SS

CHEEMA, HS

机构：

[1] Department of Soils, Punjab Agricultural University, Ludhiana

来源：

FERTILIZER RESEARCH | 1991年 / 28卷 / 01期

关键词：

NITROGEN MODEL; N-UPTAKE; NITROGEN TRANSFORMATIONS; WATER BALANCE; MASS FLOW;

D O I：

10.1007/BF01048858

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

A simulation model to predict fertilizer N behaviour in a soil-plant (wheat) system has been developed and tested. The model predicts components of field water balance (evaporation, transpiration, drainage and run-off) and changes in soil nitrogen amounts due to N transformations (urea hydrolysis, mineralization, nitrification and volatilization), N movement and plant N uptake using information on N transformation coefficients for the soil, atmospheric evaporative demand (E(pan)), leaf area development and root growth characteristics of the crop. The model predicts N uptake by wheat through mass flow using a new simplified crop cover function. The coefficients of correlation between the measured and predicted N uptake by wheat grown under three different moisture regimes in the two years (1987-88 and 1988-89) approached unity. The computed amount of residual NO3-N in the soil profile at wheat harvest matched well with the measured amount with a root mean square error of 13.7 percent. The close matching of the measured and model predicted components of nitrogen and water balances under three widely different set of irrigation treatments suggests of model's capabilities to help in on-farm N management both under irrigated and rainfed conditions.

引用

页码：73 / 84

页数：12

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