抄録
Rice Seeds Coated with the Calper were sown in the soil filled in a plastic container. A part of nitrogenous fertilizer was top dressed at different growing stages. The top dressing started from 2 months prior to the expected heading date at 5 day intervals.
The following conclusions were drawn from this experiment:
1) The maximum weight of paddy was obtained from a treatment with an application of top dressing 33 days prior to the heading date.
2) The maximum number of grains per panicle was obtained from a treatment with an application of top dressing 28 day prior to the heading date.
3) The more, lengthes of panicle, stem and leaf, the more, the number of grains per panicle.
4) The number of grains per panicle can be roughly estimated from the distribution density of the number of greater than 90 grains per panicle and less than 40 grains per panicle.
5) The stem density (Kanchomitudo) which is defined as the total length of stem of rice plant populated in unit area can be used as a parameter effective to yield prediction after heading.
