Ảnh hưởng của Brassinolide xử lý trước thu hoạch đến năng suất và chất lượng trái quýt hồng (Citrus recticulata Blanco)
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Abstract
The study determines the appropriate concentration and timing of pre-harvest Brassinolide application to improve the yield and fruit quality of quyt Hong. The experiment was arranged in a completely randomized design with two factors: (A) Brassinolide concentrations ; (B) number of applications. The solution was sprayed evenly over the canopy until both leaves and fruits were completely wet (approximately 6 liters per tree), applied in the late afternoon, while the control treatment received water only. The results showed that pre-harvest Brassinolide application significantly improved several parameters related to yield and fruit quality, including total soluble solids (°Brix), peel color, and the incidence of segment-end drying. Among the treatments, the application of Brassinolide at 1 ppm with two sprays at 113 and 105 days before harvest produced the best results, increasing fruit weight (61.54 ± 0.10 g) and total yield (67.70 ± 0.11 tons/ha), while markedly reducing the rate of segment-end drying. Furthermore, Brassinolide treatment at this concentration helps increase some fruit quality indicators (Brix level of fruit flesh: 13.47%; Percentage of dry fruit at the tip of the segment: 6.49±0.02%; Ratio of dry segments/fruit: 5.74±0.02%; Ratio of dry segment length: 2.88±0.02%), contributing to increasing attractiveness in consumption.
Tóm tắt
Nghiên cứu nhằm tìm ra liều lượng và thời gian phun Brassinolide thích hợp trước thu hoạch góp phần gia tăng năng suất và chất lượng trái quýt hồng. Thí nghiệm được bố trí theo thể thức hoàn toàn ngẫu nhiên, thừa số hai nhân tố: (A) Brassinolide; (B) số lần phun. Kết quả cho thấy việc xử lý Brassinolide trước thu hoạch góp phần cải thiện đáng kể một số chỉ tiêu về năng suất và chất lượng trái, bao gồm độ Brix, màu sắc vỏ trái và tỷ lệ khô đầu múi. Trong đó, Brassinolide ở nồng độ 1 ppm và xử lý ở 113 và 105 ngày trước thu hoạch đạt hiệu quả tối ưu nhất, đã làm tăng khối lượng trái (61,54 g), làm tăng năng suất tổng (67,70 tấn/ha), đồng thời làm giảm đáng kể tỷ lệ khô đầu múi trái. Hơn nữa việc xử lý Brassinolide ở nồng độ này giúp làm gia tăng một số chỉ tiêu về phẩm chất của trái (độ Brix thịt trái: 13,47%, tỷ lệ trái bị khô đầu múi: 6,49%, tỷ lệ múi khô/trái: 5,74%, tỷ lệ chiều dài múi khô: 2,88%).
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