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[1]CONG Huaijun,ZHANG Zhan,XU Bin.Study on Available Potassium Contents in Soils Under Different Fertilization Conditions in Highland and Gully Region of the Loess Plateau[J].Research of Soil and Water Conservation,2018,25(04):129-133.

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Study on Available Potassium Contents in Soils Under Different Fertilization Conditions in Highland and Gully Region of the Loess Plateau

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 04 Page number: 129-133 Column: Public date: 2018-06-13

Title:: Study on Available Potassium Contents in Soils Under Different Fertilization Conditions in Highland and Gully Region of the Loess Plateau

Author(s):: CONG Huaijun¹, ZHANG Zhan², XU Bin¹; 1. Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi 712100, China;
2. Yellow River Institute of Hydrology and Water Resources, Zhengzhou 450004, China

Keywords:: soil and water conservation; different fertilization conditions; soil available potassium; highland and gully region of the Loess Plateau

CLC:: S157.4⁺1

DOI:: -

Abstract:: It is very important to check the soil fertility of cultivated land and specify the appropriate fertilizer and increase the vitality and power of the land in the Loess Plateau where the cultivated land resources are insufficient. Potassium is an important element of plant requirement, but also an important indicator of soil fertility. The experiment was conducted in the simulated spoil field at Changwu Agricultural Ecology Experimental Station in Shaanxi Province on the Loess Plateau. We set three soil fertilization treatments including A: the organic fertilizer (sheep manure) was used at the rate of 30 000 kg/hm², B: Straw use rate is 9 000 kg/hm², C: no fertilization, AO (organic fertilizer, no plant), BO (straw, no plant), CK (no fertilizer, no plant) as a control, Trrifolium repens, Coronilla varia, Melilotus suaveolens, Caragana korshinskii and Lolium perenne were used as test plants to study the nutrient contents of 0—10, 10—20 cm soil layers of various plant communities under different treatments. The results showed that in 0—10 cm soil available potassium (organic manure, straw) was higher than that of non-fertilized soil. Under the condition of no fertilization, the available potassium in soil in all plots was lower than CK. Under the three different fertilization conditions, the contents of available potassium in different plots were almost the same in 10—20 cm layer, and little change was found. Only in the organic fertilizer application of Lolium perenne + Trrifolium repens plot, the content of soil available potassium was higher. Under the condition of no fertilizing, the soil available potassium content in Melilotus suaveolens plot increased by 5.14 mg/kg compared with CK, an increase rate was 3.46%. Soil available potassium contents decreased in the order: organic fertilizer> straw> no fertilizer. Under the condition of no fertilization, the average content is lower than the CK, indicating that the initial soil fertilization need to supplement the nutrients needed for plant growth. Based on the long-term continuous positioning test data of Changwu, the soil available potassium content under different fertilization conditions was studied quantitatively by combination of field test and long-term observation. The soil available potassium was investigated, which can provide the bases for rational utilization of soil in this area, the sustainable and efficient use of soil resources and agricultural production.

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