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- W2362170665 abstract "Based on long-term rotation and fertilizer test,a soil fertility numerical value comprehensive evaluation on different rotation system had been made in the gully region of the loess plateau.Contrasted with the bare land,the soil bulk density,nutrient content and enzymatic activity of alfalfa continuous,corn continuous,wheat continuous,corn wheat crop rotation and grain-bean 3-year rotation were analyzed and the correlation analysis and fuzzy mathematics theory were used to comprehensively evaluate the soil fertility under the long-term positioning conditions.The results showed that under corn continuous,wheat continuous,corn-wheat crop rotation and grain-bean 3-year rotation except for alfalfa continuous cropping,soil firmness were appropriate.The soil nutrient content under alfalfa continuous cropping was far higher than the corn continuous cropping,wheat continuous cropping,corn wheat crop rotation and grain bean 3 years' rotation.The soil enzyme activity of alfalfa continuous cropping was also higher.Under continuous cropping and/ or rotation,the soil firmness,nutrient content and soil enzyme activity were significantly higher than that of fallow land after long-term fertilization.The IFI of soil fertility levels of alfalfa continuous,corn continuous,wheat continuous,corn wheat crop rotation and grain bean 3 years' crop rotation respectively were 86.47,56.36,64.13,64.67 and 63.08,and were significantly higher than those of the fallow land(IFI 39.49).The soil fertility levels of alfalfa was continuous significantly higher than corn continuous,wheat continuous,corn wheat crop rotation and grain bean 3 years' crop rotation.The calculation method of soil bulk density's membership function was put forward to carry through numerical value comprehensive evaluation soil fertility.In conclusion,crop rotation could improve the soil nutrient content,promote the accumulation of the soil organic matter,nitrogen,phosphorus,potassium content and had become a main route to improving soil fertility levels.The fertility buildup ability of different crop and rotation way was different which related to crop species and its growth habit.The appropriate measures could be taken according to different crop rotation systems to improve their soil fertility buildup ability.On soil fertility for numerical comprehensive evaluation,the soil enzyme activity turning point of value and grading standards need further study and exploration for a more scientific and reasonable evaluation to the soil fertility level." @default.
- W2362170665 created "2016-06-24" @default.
- W2362170665 creator A5066167191 @default.
- W2362170665 date "2013-01-01" @default.
- W2362170665 modified "2023-09-28" @default.
- W2362170665 title "Soil Fertility Numerical Value Comprehensive Evaluation of Different Rotation System under the Long-term Positioning Conditions" @default.
- W2362170665 hasPublicationYear "2013" @default.
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