期刊
PADDY AND WATER ENVIRONMENT
卷 7, 期 2, 页码 151-159出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s10333-009-0157-y
关键词
Objective yield; Standard fertilizer usage; Potential nitrogen pollution load; Nitrogen mass balance; Food composition table
This research proposes an assessment for nitrogen (N) pollution loads potential from farmland, based on comparison of N in objective crop yields with standard fertilizer usage. N in the objective yield was calculated using the Standard Table of Food Composition in Japan''. Three findings were made by considering yields removed from farmland. First, paddy rice and beans have a low pollution potential, with rice paddies showing a negative pollution potential for N (around -14 kg/ha). Second, almost all vegetable and orchard crops tested had a high pollution potential for N, although this differed from crop to crop. Third, our outcomes align well with farmland pollution potential and non-absorbed nitrogen (NAN) as defined by Nishio, although the latter and indices rely on a laborious and complicated method. The correlation coefficients were 0.745 (R(2) = 0.555). These outcomes show the effectiveness of our proposed assessment for potential environmental pollution loads.
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