Luu Huu Manh * , Truong Ngoc Trung and Nguyen Nhut Xuan Dung

* Corresponding author (lhmanh@ctu.edu.vn)

Abstract

An experiment was conducted to study the effect of different nitrogen fertilizer levels (30; 50 and 70 N kg/ha) on growth and biomass production of Paspalum atratum and Macroptilium lathyroides. For Macroptilium, different nitrogen fertilizer levels did not affect on growth rate, plant height, fresh and dry biomass production. However, there was a trend to increase biomass yield of Macroptilium on treatment of 50 kg N/ha as compared to the others. For Paspalum, growth rate and plant height at 60 days after planting were affected by nitrogen levels. The highest value was found in treatment of 50kg N/ha as compared to treatment 30 and 70 kg N/ha. Fresh and dry biomass production of the treatment of 50 kg N/ha were slightly higher than those of 30 and 70 kg N/ha, although there was no significant difference among treatments. Different levels of fertilizers did not affect the composition of protein, NDF, ADF and organic matter digestibility of two feed plants. It is suggested that using 50 kg N/ha can give high biomass production for both Paspalum and Macroptilium.
Keywords: feed plants, fertilizer, growth rate

Tóm tắt

Đề tài tiến hành thử nghiệm ảnh hưởng của các mức độ phân bón 30 (NT30N), 50 (NTN50) và 70 kg N/ha (NTN70) lên đặc tính sinh trưởng và tính năng sản xuất của cỏ Paspalum atratum và đậu Macroptilium lathyroides. Đối với đậu Macroptilium, mức độ phân bón không ảnh hưởng lên tốc độ phát triển chồi, chiều cao cây, độ cao thảm, năng suất chất xanh và năng suất chất khô, tuy nhiên có khuynh hướng gia tăng ở NTN50 so với các nghiệm thức còn lại. Đối với cỏ Paspalum, chiều cao cây lúc 60 ngày tuổi ở NTN50 tốt hơn có ý nghĩa so với các NTN30 và NTN70.  Các chỉ tiêu năng suất chất xanh, chất khô và tốc độ tái sinh ở NTN50 có khuynh hướng tốt hơn các nghiệm thức còn lại. Mức độ phân bón không ảnh hưởng lên hàm lượng vật chất khô, protein thô, NDF, ADF và mức tiêu hóa chất hữu cơ của cả hai giống cây trồng. Mức độ phân bón 50 kgN/ha cho kết quả tốt trên cỏ Paspalum và đậu Macroptilium.
Từ khóa: cây thức ăn gia súc, phân bón, năng suất, sinh trưởng, thành phần hóa học

Article Details

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