Improving nitrogen-use efficiency of direct-seeded rice on alluvial soils of the Mekong River Delta [Viet Nam]
1995
Ngo Ngoc Hung | Singh, U. | Vo-Tong Xuan | Buresh, R.J. | Padilla, J.L. | Tran Thanh Lap | Truong Thi Nga (Cantho Univ., Cantho (Viet Nam))
Field experiments were conducted in 1989-92 in the Mekong River Delta of Southern Vietnam. Nitrogen (N) management practices were studied in broadcast-seeded flooded rice, which is becoming an increasingly popular alternative to transplanting in this region. Plant density and timing, method, and rate of urea application were studied. N losses from urea (28 and 18 percent) were less than those normally reported for transplanted rice. Delaying the first application of urea until 10 d after seeding (DAS) has no adverse effect on yield of broadcast-seeded rice. Diammonium phosphate (DAP) and urea plus single superphosphate (SSP) were equally effective fertilizer sources. In the normal soil, 150 kg seed/ha is suggested for broadcast-seeded rice and close transplanting spacing (15 x 15 cm) is suggested for transplanted rice in acid sulfate soils. The different split applications of urea did not give differences in grain yield and N uptake
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