Tran Thi Bich Van * , Nguyen Bao Ve and Le Bao Long

* Corresponding author (trantbvan@ctu.edu.vn)

Abstract

Purpose of the study was to evaluate the effects of calcium chloride as foliar spraying on the fruit cracking phenomena, yield and quality of Rongrien rambutan in the Nhon Ai ward – Phong Dien district – Can Tho city, 2015 season on the five–year–old trees. The experiment was carried out in Randomized Complete Block design with five treatments of calcium chloride (control; 0,5; 1,0; 2,0; and 4,0%), and ten replications, each replication of one tree. The amounts of inorganic fertilizer applied on all treatments were the same. Fertilizers were supplied for trees in 4 times. The first time was 0.32 kg.tree-1 N – 0.23 kg.tree-1 P2O5 after harvesting, the second time was 0.1 kg.tree-1 N – 0.1 kg.tree-1 P2O5 – 0.075 kg.tree-1 K2O 1 month before flowering, the third time was 0.1 kg.tree-1 N – 0.1 kg.tree-1 P2O5 – 0.075 kg.tree-1 K2O at fruit set, and the final was 0.12 kg.tree-1 K2O after fruit set. Results showed that spraying with CaCl2 had an effect on the fruit cracking phenomena through increased total Ca2+ content and peel thickness of fruits. Spraying with 2 – 4,0% CaCl2 at 8 weeks after bloom (4 times, at fifteen–day intervals) reduced the ratio of fruit cracking 1.7 – 2.2 folds, and ion leakage decline 1.62 - 1.73 folds in comparison to the control. Spraying with CaCl2 4.0%reduced yield and oBrix  comparison to the control.
Keywords: Calcium, fruit cracking, ion leakage, ‘Rongrien’ rambutan (Nephelium lappaceum Linn)

Tóm tắt

Mục đích của nghiên cứu là đánh giá ảnh hưởng của canxi clorua phun qua lá đến hiện tượng nứt trái, năng suất và phẩm chất chôm chôm Rongrien (Nephelium lappaceum Linn) tại xã Nhơn Ái – huyện Phong Điền – Thành phố Cần Thơ, mùa vụ 2015 trên cây chôm chôm 5 năm tuổi. Thí nghiệm được bố trí theo thể thức khối hoàn toàn ngẫu nhiên, gồm có 5 nghiệm thức là 5 nồng độ CaCl2 (0; 0,5; 1,0; 2,0 và 4,0%), mỗi nghiệm thức có 10 lần lặp lại, mỗi lần lặp lại tương ứng một cây. Lượng phân vô cơ sử dụng trên tất cả các nghiệm thức là như nhau, được chia làm 4 lần bón: đợt 1 (sau thu hoạch) 0,32 kg N-0,23 kg P2O5/cây, đợt 2 (trước khi ra hoa 1 tháng): 0,1 kg N-0,1 kg P2O5 -0,075 kg K2O/cây, đợt 3 (khi cây đậu trái): 0,1 kg N-0,1 kg P2O5­-0,075 kg K2O/cây, và đợt 4 (khi cây mang trái): 0,12 kg K2O/cây. Kết quả cho thấy thấy phun CaCl2 qua lá có ảnh hưởng đến hiện tượng nứt trái qua việc gia tăng hàm lượng Ca2+ tổng số và độ dày vỏ trái. Phun 2,0-4,0% CaCl2 sau khi hoa nở 8 tuần (phun 4 lần, khoảng cách hai lần phun là 15 ngày) làm giảm tỷ lệ nứt trái chôm chôm Rongrien 1,7- 2,2 lần, đồng thời làm giảm tỷ lệ rò rỉ ion 1,62 -1,73 lần so với đối chứng. Tuy nhiên, phun nồng độ CaCl2 4,0% làm giảm năng suất và ­độ Brix thịt trái so với nghiệm thức đối chứng.
Từ khóa: canxi, nứt trái, rò rĩ ion, chôm chôm 'Rongrien' (Nephelium lappaceum Linn)

Article Details

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