Green manuring effects of perennial annual and cover legumes on upland rice yield and some properties of soils
1998
Ongart Werasopon | Prapai Chairoj | Somsak Leangsirorat | Winyoo Wong-Ubol (Department of Agriculture, Bangkok (Thailand). Soil Science Div.)
Role of legumes and their planting method as green manuring affecting upland rice yield and soil properties was studied in this experiment. RCB Randomized complete block design with 4 replications and 8 treatments are the statistical design for this study. Treatments were (1) no fertilizer, (2) 4-2-2 kg/rai of N-P2O5-K2O, (3) Crotolaria juncea L. as green manuring before planting upland rice, (4) Macroptilium atropurpureum as a cover crop over the year and incorporated before planting upland rice, (5 to 8) are Acacia holosericea, Gliricidia sepium J.A.C.Q WALP,Cassia Siamea and Leucaena leucocephala. Each legume tree was planted double hedge row (50x50 cm) in the middle of upland rice plot (4.5x6 m) as alley cropping which their biomass were decapitated at 50 cm above the group level and laid down to be decomposed on the soil surface as green manuring 3-4 times. The result showed that green manuring from Gliricidia sepium J.A.C.Q WALP increased upland rice yield significantly. All the legume in this experiment slightly increased pH, OM, P and K content of the soil studied after having been established for six years.
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