田畑輪換田における土壌の窒素発現と水稲(Oryza sativa L.)による窒素吸収の圃場間と年次間の変異

日本作物学会紀事

池永 幸子¹  稲村 達也¹  井上 博茂¹  松本 二香¹ 

[1] 京都大学大学院農学研究科

关键词: Nitrogen;    窒素;    Paddy rice;    水稲;    Paddy-upland rotation;    田畑輪換;    Single crop;    一毛作;    Soil Nitrogen mineralization;    窒素発現;   

DOI  :  10.1626/jcs.74.291

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

Soil nitrogen mineralization and nitrogen absorptions by rice in paddy-upland rotational fields (rice-wheat-soybean) were studied in the Nara basin for four years (2000-2003) in comparison with those in adjacent single-cropped paddy fields. Under conditions of no nitrogen fertilization, the crop rotational fields did not increase soil nitrogen mineralization owing to decrease of total nitrogen and carbon in the soils by repeated crop rotations. However, rice at the heading and maturity stages had higher nitrogen absorptivity and higher nitrogen content in the rotational fields than in the single-cropped paddy fields, resulting in a larger number of spikelets per panicle and higher yield in the crop-rotational fields. Soil nitrogen mineralization of a paddy-upland rotational field did not vary with the year, but largely varied with the field due to physicochemical properties of their soils. The difference in the soil properties between single cropped and crop rotational fields may be minimized by supplying a nitrogen source such as organic manure to the latter.

【 授权许可】

Unknown