Nguyễn Quốc Khương * , Huỳnh Mạch Trà My , Ngô Ngọc Hưng Nguyễn Kim Quyên

* Tác giả liên hệ (old_nqkhuong@ctu.edu.vn)

Abstract

Objectives of this study were to determine the proper nitrogen fertilizer application rate and time for gaining the optimal sugarcane growth, yield and Brix. A 22 factorial experiment in a completely randomized block design including three nitrogen rates and using leaf chart color (LCC). The field experiments have been conducted in Cu Lao Dung and Long My in the year of 2012. Results showed that application of 300 kg N per hectare with using LCC gave optimum sugarcane growth and yield in Cu Lao Dung and Long My.  Especially, stalk height, internode and internode length of sugarcane were significantly higher in this treatment, but sugarcane Brix were not improved at both sites.
Keywords: Leaf chart colour, sugarcane yield, sugarcane growth, Brix, N requirement of sugarcane

Tóm tắt

Mục tiêu của nghiên cứu là xác định lượng đạm và thời gian bón đạm hợp lý cho tối ưu hóa sinh trưởng, năng suất và chất lượng mía. Thí nghiệm thừa số hai nhân tố trong bố trí khối hoàn toàn ngẫu nhiên với ba mức phân đạm và bốn phương pháp bón phân đạm được thực hiện ở huyện Cù Lao Dung và Long Mỹ. Kết quả thí nghiệm cho thấy, bón 300 kg đạm trên hecta theo so màu lá đã cho tối ưu sinh trưởng và năng suất ở Cù Lao Dung và Long Mỹ. Cụ thể, bằng phương pháp bón này đã gia tăng chiều cao, số lóng và chiều dài lóng mía nhưng không làm cải thiện độ Brix của mía ở cả hai địa điểm.
Từ khóa: Bảng so màu lá, năng suất mía, sinh trưởng mía, độ Brix, nhu cầu đạm của cây mía

Article Details

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