NGHIÊN CỨU ẢNH HƯỞNG CỦA MẬT ĐỘ CẤY VÀ LIỀU LƯỢNG ĐẠM ĐẾN SINH TRƯỞNG, PHÁT TRIỂN VÀ NĂNG SUẤT GIỐNG LÚA VAAS16 TẠI HUYỆN ĐÔNG SƠN, TỈNH THANH HÓA

Abstract

The study aimed to determine the effects of transplanting density and nitrogen fertilizer dosage on the growth, development, and yield of rice variety VAAS16 in the Spring crop, conducted in Dong Son district, Thanh Hoa province. The experiment consisted of two factors: transplanting density and nitrogen fertilizer dosage, arranged in large and small plots, respectively. The transplanting density factor was arranged in the large plot with three density levels, while the nitrogen dosage factor was arranged in the small plot with five dose levels, each with three replicates. The results revealed that both transplanting density and nitrogen dosage significantly influenced the growth, development, and yield of the rice variety VAAS16. A planting density of 45 plants/m2 and a nitrogen dose of 90 kg N/ha applied as basal fertilizer (8.0 tons of manure + 100 kg of P2O5 + 80 kg of K2O/ha) were identified as the most suitable for the VAAS16 rice variety. With this level of nitrogen fertilization and transplanting density, VAAS16 rice variety achieved the highest net yield of 6.63 tons/ha.