Effects of Varieties and Topping –Pruning Techniques on the Growth and Yield of Kale (Brassica oleracea L. var. acephala) Grown on Coconut Coir Substrate
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Abstract
The study was conducted to determine the effects of combining kale varieties with topping - pruning techniques to enhance leaf yield. The experiment followed a two-factor factorial design with five replications. Factor A included four kale varieties: green Curly, purple Curly, green Seaweed, and purple Seaweed. Factor B involved four toppings: no topping, topping with two shoots retained, topping with three shoots retained, and topping with natural shoot growth. Results showed that the Green Curly variety produced the highest leaf yield per plant among the tested varieties. The treatment involving topping and allowing shoots to grow naturally increased the number of harvestable leaves per plant but reduced individual leaf size compared to the no-topping treatment. However, this approach led to improvements in leaf brix level, dry matter content, and vitamin C concentration.
Tóm tắt
Nghiên cứu được thực hiện nhằm xác định giống kết hợp với biện pháp ngắt đọt, tỉa chồi làm gia tăng năng suất lá cải kale. Thí nghiệm được bố trí thừa số 2 nhân tố với 5 lần lặp lại. Trong đó, nhân tố A là 4 giống cải kale gồm: xoăn xanh, xoăn tím, rong biển xanh, rong biển tím và nhân tố B là 4 biện pháp ngắt đọt tỉa chồi gồm: không ngắt đọt, ngắt đọt - để 2 chồi, ngắt đọt - để 3 chồi, ngắt đọt - để tự nhiên. Kết quả cho thấy giống xoăn xanh cho năng suất lá thu được trên cây cao nhất trong số 4 giống thí nghiệm. Biện pháp ngắt đọt và để chồi mọc tự nhiên góp phần gia tăng số lá thu hoạch trên cây nhưng làm giảm kích thước lá cải kale so với không ngắt đọt, đồng thời giúp gia tăng độ brix, hàm lượng chất khô và hàm lượng vitamin C trong lá cải kale.
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