NGHIÊN CỨU XÁC ĐỊNH THÀNH PHẦN PHÂN HỮU CƠ VI SINH CHO CAO SU GIAI ĐOẠN VƯỜN ƯƠM.

Abstract

                          In recent years, the use of microbiological organic fertilizer in agriculture has been increasing rapidly. It not only has a special significance in creating the sustainable land environment but also promotes the effective use of inorganic fertilizer. The authors have determined the basic composition of microbiological organic fertilizer for rubber tree in nursery phase which includes: peat 50%; agricultural waste 45%; muck 5%; N: P: K at the ratio of 0.6:1:0.5; Mg, Ca, S, Mn, Fe, Mo, B, Zn, Cu at the ratio of 0.15%, 0.2%, 0.2%, 0.02%, 1.5 ppm, 15 ppm, 20 ppm, 10 ppm, 2

ppm and microquantity fertilizer Phan Tien 0.1% respectively. Microbiological organic fertilizer had good effect on rubber tree in nursery phase: after manured about 90 days, the height of rubber tree trunk by the experimental formula CT2 (manured microbiological organic fertilizer) reaches to 52.6 cm (increases by 33.0 cm), while it only reaches to 41.3 cm (increases by 20.9 cm) by using the experimental formula CT1. The number of leaf layers/tree and the average diameter of the trunk increase remarkably; the number of leaf layers/tree is 4.8 and the average diameter of the trunk is 9.3 mm by using the experimental formula CT2. Meanwhile, with CT1, these figures are 3.1 anh 7.9 respectively.