Effect of crotalaria, sorghum and pampas grass incorporated as green manure on the yield of succeeding crops and soil physical and chemical properties

Goto, S.; Nagata, S.

Japanese Journal of Soil Science and Plant Nutrition 71(3): 337-344


Accession: 003415923

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Field studies were carried out for 9 years to examine the effect of long-term application of green manure (sorghum, Crotalaria, pampas grass [Cortaderia argentea]) on the yield of succeeding crops (potato and taro [Colocasia esculenta]) and the physical and chemical properties of dark red soil. The results showed: (1) the average fresh yields of sorghum and Crotalaria were 28 and 61 t ha-1, respectively. Pampas grass collected from the grassland was 50 t ha-1. These were cut and incorporated into soil by rotary tillage every September, and potato (Norin No. 1) or taro (Ishikawa wasemaru) was planted approx. 3 months after incorporation; (2) the average yield of potato (8 times) was significantly (11-18%) higher for the plot incorporating green manure as compared to the control plot, whereas in the case of taro (2 times), there was no significant difference; (3) total carbon, total nitrogen, and exchangeable K contents of the soil increased with the successive application of green manure. The increase rate of total carbon followed the order: pampas grass>sorghum>Crotalaria. It was suggested that 25 and 30% of the nitrogen in sorghum and pampas grass be incorporated into the soil, respectively. It was suggested that ~30% of the nitrogen be decomposed in the plot of Crotalaria. The increase rate of exchangeable K was 0.026-0.084 cmol(+) kg-1 per year. The amount of exchangeable Ca and Mg decreased. The decrease rates were 0.23-0.38 and 0.09-0.13 cmol(+) kg-1, respectively. These results suggested that it is necessary to decrease the amount of sodium fertilizer and check the exchangeable Ca and Mg after the application of green manure; and (4) the porosity of the soil increased and bulk density decreased with the successive application of green manure.