Study on the Change of Soil Nutrients in Drip Irrigation Farmland
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Lin Li, Zhao Li
Soil total N, total P, total K organic matter and soil available N, P and K are the three elements that provide fertility for crop growth. The former characterizes soil basic nutrients and the latter can effectively absorb and utilize soil available nutrients for crops. In order to understand soil total amount, soil available nutrients change, nutrient utilization and production effect of drip irriga-tion crops, 12 crops (spring wheat, spring wheat, soil available nutrients, soil available nutrients) are based on drip irrigation. The 1008 test data of 144 fixed-point samples from paddy, potato, millet, soybean, rape, sunflower, beet, melon, tomato, carrot and alfalfa fields were collected. The results showed that the content of soil total N was stable in 95% confidence interval, and the con-tent of soil total P, K and organic matter changed obviously. Soil available N, P and K had similar characteristics. The results showed that the N absorption of drip irrigation soil was stable, and the P and K utilization fluctuated greatly. With the non-linear increase of drip irrigation unit water consumption and yield, soil total and available nutrients decreased from high to low, soil total nu-trients decreased by 42.6% - 25.8%, soil available nutrients decreased by 58.5% - 34.8%, and the decline rate was significantly greater than that of soil total nutrients, reflecting the soil available nutrient capacity. The average soil available nutrient consumption of 12 drip irrigation crops was 19.6%. Among them, 11.2% - 55.2% was used as low yield drip irrigation crops (rape, melon, sun-flower, soybean, spring wheat, rice, millet), and 1.3% - 5.5% was used as drip irrigation crops (tomato, carrot, sugar beet, potato, alfalfa) with relatively high yield. The results showed that the soil water and fertility potential of drip irrigation farmland was friendly to the ecological envi-ronment. Good regulation and control can provide reference.
Drip irrigation; Farmland ecology; Soil nutrients; Change analysis