Tính chất đất trong canh tác lúa 3 vụ ở Đồng bằng sông Cửu Long

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Tác giả: Hữu Thịnh Lê, Võ Châu Ngân Nguyễn, Thị Thùy Loan Trần

Ngôn ngữ: Vie

Ký hiệu phân loại:

Thông tin xuất bản: Khoa học - Đại học Thủ Dầu Mội 2022

Mô tả vật lý: 62-71

Bộ sưu tập: Metadata

ID: 407158

Thêm vào giỏ Liên kết toàn văn

Nghiên cứu nhằm đánh giá diễn biến tổng đạm, tổng lân và hàm lượng chất hữu cơ trong tầng đất mặt của ruộng lúa thâm canh ba vụ. Khu ruộng thí nghiệm 200m2 được bố trí nằm ở góc một mảnh ruộng lớn để thống nhất các hoạt động canh tác như mật độ sạ, lượng phân bón, thuốc bảo vệ thực vật. Tầng đất mặt ruộng ở độ sâu 10cm được thu 5 mẫu, trộn đều các mẫu và lấy khoảng 1kg mẫu để phân tích và đánh giá. Mẫu đất được thu thập ở hai vụ canh tác liên tiếp gồm vụ 3 và vụ Đông Xuân. Kết quả phân tích cho thấy diễn biến tổng lân trong cả hai vụ canh tác đều giảm trong 2 tuần đầu nhưng sau đó có sự khác nhau
đất vụ 3 có hàm lượng tổng lân tăng theo thời gian nhưng ở vụ Đông Xuân có xu hướng ổn định. Tuy nhiên hàm lượng đạm tổng số ngược lại, trong bốn tuần đầu đạm tổng số ổn định ở vụ 3 nhưng vụ Đông Xuân có xu hướng tăng
và trong giai đoạn sau đều ổn định cho cả hai vụ. Hàm lượng chất hũu cơ trong đất có xu hướng ổn định từ đầu đến cuối vụ canh tác trong cả hai vụ. Kết quả cho thấy có sự biến động về hàm lượng dưỡng chất và chất hữu cơ trong đất canh tác lúa thâm canh và cần được nghiên cứu chuyên sâu thêm., Tóm tắt tiếng anh, The study aimed to evaluate the changes in total nitrogen, total phosphorus and organic matter content in the topsoil of intensive rice fields. The experimental field of 200m2 is located in the corner of a large field to unify farming activities such as seeding density, fertilizer quantity, and pesticides application. Five topsoil samples at a depth of 10cm was collected at five points on the experiment field, mixed the samples and took about 1kg of samples for analysis and evaluation. Soil samples were collected in two consecutive farming seasons including the 3rd crop and the next Winter - Spring crop. The results of the analysis showed that the changes in total phosphorus in both cultivation crops decreased in the first 2 weeks but there was a difference after that
soil in the 3rd crop has the total phosphorus content increasing over time, but it tends to be stable in the Winter-Spring crop. However, total nitrogen content was opposite, in the first four weeks total nitrogen was stable in the 3rd crop but tended to increase in the Winter-Spring crop
and in the later period are stable for both crops. The soil organic matter content tended to be stable from the beginning to the end of the growing season in both crops. The results show that there are fluctuations in the soil nutrient and soil organic matter content in the intensive rice cultivation rice field and need to be studied further.

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