Asparagine test in relation with the nitrogen nutritional status of crop plants I |
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| Authors: | Shingo Mitsui Kikuo Kumazawa Mahatim Singh |
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| Institution: | Faculty of Agriculture , The University of Tokyo , Tokyo |
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| Abstract: | Extraordinary features of submerged rice soils and its relation to manuring practices has long been the problem of study to increase the average and maximum yield of rice per unit area. Out of these studies many remarkable results have so far been achieved, the mention of which in dentail is not possible in this paper. But in a summarized way it can be easily concluded that during the growth cycle of rice plant nitrogen is most important limiting fertilizer element and its need for the plant is multi-sided. The practical experience of the farmers of Shizuoka prefecture is quite in agreement with this, as they say that in rice-culture fertilizer should be applied at the transplanting time and a little before actual heading. Regarding the late dressing which is called (Hogoe) they have strong belief that it is effective in most of the cases. Taking this into account, in 1933 YAMAMOTO and SUZUKI(18) started to study as to when top dressing be applied with the help of pot experiments, and Were able to conclude that a top dressing of 0.5 g per pot was quite effective. This report is the first to be published on the top-dressing aspect of rice, but it does not seem to be a complete one. A field experiment for such a study was conducted by GOTO(1) in the year 1942. In his experiment, he used ammonium sulphate for top dressing with 3 dates viz. a) Maximum tillering b) Late tillering and c) Panicle formation. He concluded that amm. sulphate as top-dressing is mostly absorbed in the panicle formation stage and is utilized for grain formation. He also stressed the importance of top-dressing at the panicle formation stage. |
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