Fertilizer management for improving rice production and soil fertility in degraded soil of Bac Giang province (AFACI)
2014
Pham Dinh Rinh; Lai Nguyen Xuan; Phai Do Duy; Ha Pham Nguyen
In Vietnam, fertilizer apply for crop was still wasteful and unappropriate and it depreciated the effective fertilizer to the plant. Especially in hilly and mountainous region the agricultural land is high in slope. One study on the fertilizer management for improving rice production in mountainous and hilly region of Vietnam by using nitrogen fertilizer for Khang dan 18 rice variety. The fertilizer apply rates of (0-30-60-90-120) for summer crop and (0-30-60-90-120-150) for spring crop at the three different nutrient regions of Hiep Hoa district, Bac Giang province. Three experiments was conducted at the three different nutrient regions and it was designed in RCBD with 7 treatments and 3 replications. The study result showed that (i) Rice yield was significant influence by treatments from 30 to 90 kgN.ha-1 in comparing with control (treatment 2) and the rice yield of applying 90 to 120 kgN.ha-1 was not significant increase and from 120 to 150 kgN.ha-1 the rice yield decrease. Based on correlative equation between N application rates and rice yield for each soil nutrient region, it's recommend to farmers of Hiep Hoa district that: In low nutrient soil regions, N fertilizer could apply about 90-100 kgN.ha-1, in medium nutrient soil regions N fertilizer can be90-100 kgN.ha-1, and in high nutrient soil regions, N fertilizer is 90 kgN.ha-1 .(ii) The chlorophyll index measured range from 39 to 40 by SPAD measurement that gives the high yield obtained and the second measurement chlorophyll index is much more correlative with the yield obtained than the first measurement. Second measurement chlorophyll index is much more correlative with the yield obtained than the first measurement.
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