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| DOI：10.13522/j.cnki.ggps.20180605 |
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| Characteristics of Soil Fertility and Its Relation with Crop Yield in Fluvo-aquic Soil Irrigation Area of North Henan |
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LIU Zhandong, ZHANG Kai, MI Zhaorong, HUANG Chao, MA Yanchuan, YU Xuan, SUN Jingsheng, FAN Kun, HUANG Shiqing, LI Changyou, ZHANG Jingmang
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1. Key Laboratory for Crop Water Requirement and Its Regulation, Ministry of Agriculture, Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China; 2. Henan Institute of Science and Technology, Xinxiang 453002, China; 3. Qinyang Meteorological Bureau，Henan province，Qinyang 454550, China; 4. Guang Li Irrigation Authority, Jiaozuo City, Henan Province, Qinyang 454550, China;5.Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China
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| Abstract: |
| 【Objective】Study the soil fertility characteristics of tidal soil irrigated land in northern Henan and its relationship with crop yield, and provide basic data support for the establishment of reasonable plough layer evaluation index for irrigated land in the tidal soil area of northern Henan.【Method】This study conducted a sample survey of 62 samples in the tidal zone of northern Henan. The survey indicators included depth of tilling layer, thickness of plow bottom layer, soil volume quality, soil compactness, soil pH, soil conductivity, soil organic matter, soil available phosphorus, soil available potassium, tillage methods, sowing, irrigation and fertilization.【Result】The overall tillage depth of the field in the tidal soil area of northern Henan was 16.8 cm, and the thickness of the plow floor was 11.2 cm. The depth of the low-yielding field was 15.2 cm, the thickness of the plow layer was 11.9 cm, the depth of plough layer was 20.0 cm, and the thickness of plough bottom was 9.8 cm. The average compactness of high, medium and low yield fields in the ploughed soil were 1 725, 1 449, 1 831 kPa, the average soil volume quality of high, medium and low yield fields were 1.46, 1.51, 1.53 g/cm3, the average soil pH of high, medium and low yield fields were 8.47, 8.39, 8.39, the average organic matter content of high, medium and low yield fields were 12.34, 11.81, 10.67 g/kg, the average available phosphorus contents of high, medium and low yield fields were 16.05, 12.84, 10.89 mg/kg, the average available potassium of high, medium and low yield fields were 156.69, 157.20, 120.56 mg/kg, respectively, and the nutrients are mainly distributed in 0~40 cm soil. The yield was significantly positively correlated with depth of tilling layer, soil available potassium, soil organic matter and soil available phosphorus of the topsoil, and was significantly negatively correlated with thickness of plow bottom layer, soil compactness and soil volume quality of the topsoil. The yield was significantly negatively correlated with deep soil pH, and significantly positively correlated with deep soil available potassium and deep soil organic matte.【Conclusion】The main factors affecting crop yield in the tidal soil area of northern Henan are the depth of tilling layer, the thickness of plow bottom layer, and the soil available potassium and the soil organic matter in the plough layer. The contribution to crop yield is the depth of tilling layer > the thickness of plow bottom layer > the soil available potassium > soil organic matter. |
| Key words: fluvo-aquic soil of north Henan; yield; tilling layer; plow bottom layer; physical and chemical properties of soil; correlation analysis |
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