Research Article
Improvement of the Field Productivity in Rehmannia glutinosa Libosch. Crops by Application of N, P and K Fertilizers and Plant Spacing
Thanh Loan Pham ,
Van Huy Nguyen,
Thi Le Thu Hoang,
Thi Tam Tien Ha,
Chi Nghia Phan,
Xuan Duong Vu and Thi Thu Tran