CHOOSE OF SOWING TIME FOR KHAU XIEN PAN PURPLE STICKY RICE IN BAO LAM DISTRICT, CAO BANG PROVINCE
Abstract
Khau Xien Pan Purple sticky rice is a specialty glutinous rice variety of Bao Lam district, Cao Bang province. In order to improve productivity and economic efficiency and contribute to the expansion of this rice variety, we conducted an experiment with 03 sowing/transplanting times. CT1: Sowing on May 19, 2022, transplanting when the seedling is 40 days old; CT2: Sowing on May 29, 2022, transplanting when the seedling is 30 days old; CT3: Sowing on 04/06/2022 transplanted when the seedling is 25 days old. The experiment was laid out in a complete randomized block design with 3 replicates. The results showed that the growth time decreased gradually at the late sowing time; tillering ability is not high in all sowing/transplanting times. Plant height, percentage of firm seeds and 1000-seed weight were not clearly affected by sowing/transplanting times. Effective branching and effective tillering rate, effective number of panicles/m2, number of firm seeds/head, theoretical yield, and actual yield in the CT2 time frame were significantly highest compared with the 2 time frames CT1 and CT3. The CT2 seasonality frame has the same pest and disease resistance as the CT1 time frame and is better than the CT3 cropping time frame. The best time frame with Khau Xien Pan Purple sticky rice is CT2 Sowing on May 29, 2022, transplanting at 30 days old, the yielded 5.46 tons/ha.