Nguyễn Như Hà1
1 Đại học Nông nghiệp I Hà Nội
Từ khoá: xác định, phân bón, lúa, bón phân, Hà Giang
Summary
Determining suitable fertilizer for rice in main growing area in Ha Giang province
Study was caried out in Bac Quang district, Ha Giang province. Optimal quantity of fertility for intensive rice (on basis 10 tons manure/ha) for summer crop is 120N-60P2O5-60K2O kg/ha, and for spring crop 9on basis 8 tons/ha) is 150 N -90P2O5-90K2O kg/ha. Efficiency of fertilizers is 10.9-22.1 kg grain/N; 6.1-18.7 kg grain/kg O2O5; 2.8-14.3 kg grain/kg K2O5; 2.2-11.9 kg grain/kg NPK for spring crop; 9.2-16.9 kg grain/kg N, 7.0-14.6 kg grain/kg P2O5, 9.8-19.2 kg grain/kg K2O, 4.1-11.6 kg grain/kg NPK for summer rice crop.