The Effect of Date and Rate of Planting and Clipping on Grain Production of Fall Sown Oats

Abstract

The experiments reported in this paper were designed to study the effect of date and rate of seeding and clippirig on oat grain yileds in Chugoku district of Japan. The results are summerized as follows : 1) Forage yields of clipping plots were greatest when oats were planted in mid-October, while seeding in the latter part of September produced slightly less than in the above planting date. As compared with those 2 dates of planting, the plot planted in November indicated high reduction of the yields. It was observed that the yields were increased in proportion to the rise of seeding rates. 2) Under the unclipped conditions, no significant differences of grain yields were indicated between the plots of September and October planting. In contrast with those results, the grain yields of clipping plots were most at the earliest date of planting treatments (in Sept.) and significant reduction of yields occurred in the plots of October planting. Regardless of clipping or no, the grain yields of the latest planting treatments (in Nov.) were very significantly lower than the others. 3) Generally, the grain yields of clipped plots decreased in comparison with unclipped plots. Above all, when date of planting was in October or November, the reduction was highly significant. 4) In 1955-56, the clipped plots were sown in September produced extremely lower yields than the unclipped plots at the same seeding date. These striking reduction in the former plots was due to some serious diseases (such as Puccinia Lolli and Giberella Saubinetii). On the contrary, these were indisposed in 1956-57. Thus, no significant difference of grain yields were indicated between those plots. 5) Among 3 different rates of seeding, 6 Sho per Tan was most favorable for the grain production. From these results, the author concluded that the best production of oat grains will be expected from the following date and rate of planting : Planting for grain production only……in mid-October. Planting for forage and grain production……in the latter part of September. Seeding rate for all purposes……6 Sho per Tan.