A Single Basal Application of Controlled-Release Coated Urea to Rice Cultures Using Pot Seedlings in a Cool Region

Japanese Journal of Crop Science

Tokuo SATO¹  Masahiko SAIGUSA¹  Kyoichi SHIBUYA¹ 

关键词: Controlled-release coated urea;    重窒素;    ^<15>N;    収量;    Pot seedlings;    水稲;    Rice culture;    全量基肥施用;    Single basal application;    肥効調節型被覆尿素;    Yield;    ポット苗;   

DOI  :  10.1626/jcs.66.11

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

A low-cost, high yielding culture of rice was studied by the application of controlled-release coated urea (CU) to pot seedlings (PS) -raised in a pot culture nursery box- cultivated in a cool region, and compared to the application of conventional fertilizer (CF) to pot seedling (PS) and mat seedlings (MS) -raised in a broadcast secding nursery box. The plant length and the number of tillers per hill in the PS plots were longer and larger than those in the MS plots due to the superior characteristics of the seedlings. However, the number of tillers/m2 in the PS plots was less than that in the MS plots. Reflecting the nitrogen released from the coated urea, the plant length and number of tillers/m2 in the PS-CU plots were inferior to those in the PS-CF and MS-CF plots at the early growth stage. However, after the neck node differentiation stage, these were reversed due to the increased release of nitrogen from the coated urea. As a result, the leaf color value and dry weight of the rice in the PS-CU plots were higher than those in the PS-CF and MS-CF plots. The yields of brown were in the following order : PS-CU plot > PS-CF plot > MS-CF plot. The number of panicles and spikelets were larger in the PS-CU plot than those in the PS-CF and MS-CF plots, which might affect the increased yield. It seems that the photosynthetic activity of the rice plants in the PS-CU plot was maintained at a high rate throughout the ripening stage. The nitrogen uptake and efficiency of the applied fertilizer were in following order:PS-CU plot > PS-CF plot > MS-CF plot. The recovery of basal nitrogen in coated urea (63∼68%) was much greater than that of ammonium sulfate (30∼40%), and greater than the recovery of the top dressed nitrogen of ammonium sulfate (41∼59%).

【 授权许可】

Unknown