Effect of long-term application of organic matters and calcium silicate on paddy fields
1999
Sakai, K. (Fukuoka-ken. Agricultural Research Center, Chikushino (Japan)) | Kuroyanagi, N. | Fujita, A. | Odahara, K.
This experiment was carried out in well-drained fertile paddy soil (sandy loam)by cultivating rice, wheat and barley to investigate the effects of long-term application of rice straws. sawdust-cattle manure and calcium silicate on rice yield and on chemical properties of the soil. Rice yields increased by tons-ter applications of rice straws(0.5t/10a) or rice straws with the manure (2t/10a) and calcium silicate (140 kg/10a). Humus, exchangeable potassium, available phosphoric acid, available nitrogen and available silicic acid in the soil decreased when chemical fertilizer only was applied for many years. On the contrary, when all the reduced rice straws were retained for years in the paddy, the available nitrogen content in the soil remained at the same level. But, humus, exchangeable potassium available phosphoric acid and available silicic acid contents decreased. Exchangeable potassium, available phosphoric acid and available nitrogen contents in the soil increased by long-term application of the manure. But the humus content was maintained by long-term application of the manure. Exchangeable potassium, available phosphoric acid, available nitrogen and available silicic acid contents in the soil increased by long-term, application of the manure with rice straw and calcium silicate, but the humus content remained the same. Consequently. it is considered effective to apply rice straw, sawdust-cattle manure and calcium silicate for stabilizing humus content, to increase the available silicic acid in the soil and to maintain a high level and stable rice yield in well-drained fertile paddy soil
Показать больше [+] Меньше [-]