乾田ばら播き栽培における牛ふん尿の多施が水稲の穂相、収量構成要素に及ぼす影響

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A large amount of feces and urine of cattle (4 t/a) was applied to direct broadcast seeding culture of paddy rice on upland field, using the cultivar "Kotominori". The morphological characteristics, especially of the panicle and yield components, of the plant grown by the feces and urine were compared with that grown by the chemical fertilizer. The application of feces and urine had significant increase of the lengths of culm, panicle and upper internode, but had little effects on the length of flag leaf and the number of panicles, living leaves and spikelets per square meters. As for the mophological characteristics of panicle, the number of primary and secondary rachis-branches, the number of differentiated spikelets on each rachis-branch, and the occurrence of the primary rachis-branch which had 6 and more spikelets and twin rachis-branch were all increased by application of feces and urine. Of the various yield components, the increase of the number of spikelets per panicle was the most contributive to the increase of grain yield. It seemed, judging from these results, that feces and urine had a remarkable effect on the later growth stage, especially the young panicle formation stage of rice plants.「コトミノリ」を用いた乾田ばら播き栽培において, ふん尿施用区にaあたり4tの牛ふん尿を施用し, 化学肥料を施用した場合と比較しながら, 水稲の生育状況, 穂相, 収量構成要素について調査した. ふん尿施用区においては化学肥料施用区に比べ, 稈長, 穂長, 上位節間長が有意に長くなった. しかし止葉長, 面積あたり生葉数, 穂数, 頴花数については両区の間に差異は認められなかった. 最長稈における穂相は各形質ともにふん尿施用区で大きく, また6粒以上分化1次枝梗および輪生枝梗の発現率が高く, かつ頴花の退化が少なかった. ふん尿施用区における収量増加は収量構成要素のうち, 1穂頴花数の増加に直接関連しており, 以上の結果からみて, 牛ふん尿の多施は化学肥料施用の場合に比べ, 水稲体の生育を健全に保つうえからみても好ましいものと考えられた.
香川大学の論文
1977-09-30

乾田ばら播き栽培における牛ふん尿の多施が水稲の穂相、収量構成要素に及ぼす影響

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