Hồ Công Trực, Phạm Quang Hà (trang 57-61)
Từ khoá: cân bằng dinh dưỡng, cà phê, cà phê vối, đất bazan, Tây Nguyên
Study on nutrient balance for robusta coffee in productive stage on basaltic soil of Western Highlands of Vietnam
Based on the total of nutrients added to soil as well as amount of nutrients loss, research results in 2002 showed that application of only organic fertilizer without chemical ones resulted in deficiency of major (N, P, K) and secondary (Ca, Mg) nutrients for coffee. Application of 270-300kg N, 100-150 kg P2O5 and 270-300 kg K2O in combination with 5000 kg of cattle dung /ha/year has led to surplus of 15.8-25.8% N, 7.3-18.9% P and 0.5-6.7% K, but lack of 41.6-58.1kg Ca and 15.2-31.1 kg Mg in comparison with the requirement of plant.