Tác động của phân chuồng và phân bón vô cơ đến động lực học của khối lượng vi sinh vật trong hệ sinh thái nông nghiệp khô hạn nhiệt đới

Biology and Fertility of Soils - Tập 19 - Trang 231-238 - 1995
N. Ghoshal1, K. P. Singh1
1Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi, India

Tóm tắt

Sự thay đổi trong khối lượng vi sinh vật trong đất sau khi ứng dụng phân chuồng và phân bón vô cơ, cả riêng lẻ và kết hợp, đã được nghiên cứu trong hai chu kỳ hàng năm trong chuỗi cây lúa - đậu lăng được trồng dưới điều kiện khô hạn mưa. Trong hai chu kỳ hàng năm, mức khối lượng vi sinh vật C (μg g-1) dao động từ 146–241 (x = 204), 191–301 (245), 244–382 (305), và 294–440 (365) ở các ô kiểm soát, phân bón, phân chuồng và phân chuồng+kết hợp phân bón, tương ứng. Các khoảng tương ứng cho khối lượng vi sinh vật N (μg g-1) là 16.5–21.0 (19.5), 20.4–38.2 (26.0), 23.0–34.6 (27.0) và 26.2–42.4 (33.3), và cho khối lượng vi sinh vật P (μg g-1) 4.4–8.2 (7.0), 6.0–11.2 (9.6), 11.2–22.0 (17.0), và 10.0–25.4 (18.3). Sự gia tăng tối đa của khối lượng vi sinh vật, do các đầu vào này, đã được quan sát thấy dưới điều trị phân chuồng+kết hợp phân bón, theo sau, theo thứ tự giảm dần, là phân chuồng đơn lẻ và phân bón đơn lẻ. Trong từng giai đoạn sinh trưởng của cây trồng, mức khối lượng vi sinh vật giảm mạnh từ giai đoạn cây con đến giai đoạn ra hoa và sau đó tăng nhẹ với sự chín muồi của cây trồng. Mức khối lượng vi sinh vật C và P tối đa đã được quan sát trong thời gian fallow mùa hè. Sự tích lũy khối lượng vi sinh vật N tối đa xảy ra vào đầu mùa mưa, ngay sau khi bón phân cho đất. Khối lượng vi sinh vật C, N và P có mối quan hệ tích cực với nhau trong suốt chu kỳ hàng năm.

Từ khóa

#phân chuồng #phân bón vô cơ #khối lượng vi sinh vật #hệ sinh thái nông nghiệp #khô hạn nhiệt đới

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