Green manuring of corn (Zea mays L.) with Crotalaria mucronata Desv. as intercrop and its effect in some soil properties
1988
Tan, F.M.
Incorporation of C. mucronata intercrop at 25 and 35 DAP [days after planting] resulted in greater dry matter accumulation of corn at 45 and 60 DAP, produced taller plants, longer ears, greater ear diameter and high corn yields. Weed control did not significantly affect corn stand, dry matter accumulation of corn at 45 and 60 DAP, plant height, corn yield and yield components. Weed control and time of incorporation of Crotalaria intercrop did not significantly affect the number of days to tasseling and silking of corn. Incorporation of 30-day old Crotalaria increased soil organic matter, soil nitrogen, exchangeable potassium and cation exchange capacity but decreased soil pH and available phosphorus. Percent nitrogen of corn stover was significantly higher at 20 than at 10 kg/ha seeding rate of Crotalaria and when incorporation was done by four passes of native plow. Higher nitrogen uptake of corn stover was observed at seeding rate of 20 kg/ha Crotalaria. Twenty kilograms per hectare of C. mucronata intercrop plus 15.0, 22.5 or 30.0 kg N/ha as sidedress resulted in comparable dry matter accumulation at 45 and 60 DAP, grain yield and ear length of corn when incorporation was done by uprooting followed by two passes, slashing followed by two passes or four passes of the native plow. Significant interaction between seeding rate of the legume and inorganic N level as sidedress was noted on dry matter accumulation at 45 and 60 DAP, plant height, grain yield and ear length of corn. The use of 20 kg/ha C. mucronata green manure intercrop incorporated by two passes of the native plow at 30 DAP plus 50% of the recommended amount of N as sidedress fertilization was the most economical of all the approaches studied
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