Studies on Utilization of Organic Manures and Cropping System : II. Effect of the gulle on the yields of the annual forage crops

Abstract

1. Introducing the gulle system as the effluent disposal system into the experiment farm, authors studied for two years its effect on the yield of the Italian ryegrass (October/1965-June/1966, October/1966-June/1967), and on that of the Rhodes grass (June/1966-October/1966, June/1967-October/1967) which were sown on the same field alternatingly. 2. The excreta of two milch cows were applied to the field of 10a. Nitrogen amount applied to the Italian ryegrass and to the Rhodes grass were estimated as 51 kg/10 a, respectively. The artificial fertilizer was applied only to the Italian ryegrass as the basal dressing. 3. The yield of the Italian ryegrass was 0.9-1.3 t/10 a in the dry weight, and that of the Rhodes grass was 0.8 t/10 a in the dry weight, that is, total yield of both grasses was 1.8-2.1 t/10a/year in the dry weight or 16 t in the flesh weight. Such result shows that the gulle as a grassland fertilizer can be used in place of the artificial one.