Ảnh hưởng của tỷ lệ kali, canxi và magiê trong đất trồng đến khả năng hấp thu dinh dưỡng của cây bưởi

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Tác giả: Huu Nguyen Hien, Maneepong Somsak, Cong Nguye Thanh

Ngôn ngữ: Vie

Ký hiệu phân loại: 580.589 Plants

Thông tin xuất bản: Tạp chí Khoa học Trường Đại học Vinh, 2020

Mô tả vật lý: 16-21

Bộ sưu tập: Metadata

ID: 417485

Thêm vào giỏ Liên kết toàn văn

Kali (K), canxi (Ca) và magiê (Mg) là những yếu tố dinh dưỡng có vai trò quan trọng đối với quá trình sinh trưởng và năng suất của cây bưởi. Tuy nhiên, những yếu tố dinh dưỡng này lại có tính đối kháng rất cao. Mục đích của nghiên cứu này là đánh giá ảnh hưởng của tỷ lệ K, Ca và Mg trong đất đến khả năng hấp thu dinh dưỡng. Mẫu đất được lấy xung quanh tán cây bưởi ở độ sâu từ 0 đến 20 cm. Mẫu lá từ 3 đến 5 tháng tuổi được lấy trên cây cùng với mẫu đất. Thành phần hóa học trong đất và hàm lượng dinh dưỡng trong lá được phân tích. Kết quả nghiên cứu cho thấy khả năng hấp thu lân (P) bị ức chể bởi hàm lượng Ca trong đất cao. Tỷ lệ K/Mg trong đất cao (0,52 ± 0,27) ảnh hưởng tích cực đến sự hấp thu K. Tỷ lệ K/Mg trong đất thấp (0,42 ± 0,20) ảnh hưởng tiêu cực đến sự hấp thu K, mặc dù hàm lượng K dễ tiêu trong đất cao hơn ngưỡng thích hợp cho cây bưởi. Tỷ lệ mole K/Ca trong lá cao hơn so với trong đất, do vậy khả năng hấp thu K tốt hơn so với Ca, mặc dù hàm lượng K trong đất thấp hơn. Hơn thế nữa, khả năng hấp thu K tốt hơn so với Mg, bởi vì tỷ lệ K/Mg trong lá cao hơn so với trong đất. Tuy nhiên, hàm lượng K trong lá ở vườn bưởi Pakpanang thấp hơn ngưỡng thích hợp, bởi vì hàm lượng Mg dễ tiêu trong đất cao đã ức chế khả năng hấp thu K. Hàm lượng Ca dễ tiêu trong đất thấp ảnh hưởng tiêu cực đến sự hấp thu Ca, mặc dù tỷ lệ mole Ca/Mg trong đất cao (2,77 ± 1,18)., Tóm tắt tiếng anh, Potassium (K), calcium (Ca), and magnesium (Mg) are important nutrients for the pummelo's growth and productivity. However, these nutrients are strongly antagonistic to each other. This study aims to examine the effects of different K, Ca, and Mg ratios in soil on nutrient uptake of pummelo plant. Soil samples were collected under pummelo canopies at a depth of 0 cm to 20 cm. Leaf samples of 3 to 5 month old were obtained from the same trees. The soil's chemical properties and nutrient concentrations in the leaves were determined. The results showed that the P uptake was inhibited by a high Ca concentration in soil. High K/Mg ratio in soil (0.52 ± 0.27) positively affected on K uptake. Low K/Mg ratios in soil (0.42 ± 0.20) negatively affected on K uptake, although exchangeable K in soil was much higher than optimum ranges. The K/Ca mole ratio in the leaves was higher than that in the soil
therefore, the uptake of K was better than that of Ca, despite the lower concentration of K in the soil. Moreover, the uptake of K was better than that of Mg, because the K/Mg ratio in the leaves higher than that in the soil. Low exchangeable Ca negatively affected on Ca uptake, although Ca/Mg mole ratio in soil was high (2.77 ± 1.18).

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