水稲の冷害に関する栽培学的研究 (2) : 穂孕期不稔に関する葉身の限界窒素含有率

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  • 水稲の冷害に関する栽培学的研究　ＩＩ　　穂ばらみ期不稔に関する葉身の限界窒素含有率
  • Studies on Cool Injuries with Special Reference to Cultural Improvements in Rice Plants : II. Critical nitrogen content in leaf blade in relation to sterility caused by cool temperature at the booting stage
  • スイトウ ノ レイガイ ニ カンスル サイバイガクテキ ケンキュウ 2 スイヨ

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It is well known that application of heavy rate of nitrogen fertilizer to obtain higher yield of rice give a negative effect a cool weather year. For adequate nitrogen application, critical nitrogen cantents in leaf blade at the booting stage in relation to booting sterility were surveyed in the materials which were supplied with nitrogen : basal and top dressing at the spikelet differentiation stage. The curves of nitrogen content in leaf blade at the booting stage-relative value of fertility were drawn by free-hand. Relative value of fertility generally decreased slowly at first, then very rapidly with the increase in nitrogen content. The advance of these processes was similar irrespective of different temperatures, varieties and experimental sites (Figs. 5, 6, and 7). The critical nitrogen contents in leaf blade which were calculated from these curves (content at which fertility attained 90% of fertility in minimum nitrogen content plot) were 3.0∼3.3% in Shiokari and 3.3∼3.6% in Ishikari, respectively.

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