声明
Abbreviations
CHAPTER 1 INTRODUCTION
1.1 Phosphorus (P) and Potassium (K) uptake in green manure
1.2 Effects of green manure on available P and K of soil
1.3 Effects of green manure crops on soil enzymatic activities
1.4 Role of enzymes and its relationship with soil properties
1.5 Existing problem
1.6 Scientific Questions
1.7 Objectives and technical route
1.7.1 Objectives
1.7.2 Technical route
Chapter Ⅱ Materials and Methods
2.1 Experimental designs
2.1.1 Effects of P and K application on milk vetches
2.1.2 Influences of green manure crops on soil phosphorus and potassium
2.2 Plant and soil sampling
2.2.1 Pot experiments
2.2.2 Plot experiments
2.3 Measurements
2.3.1 Determination of soil and plant
2.3.2 Soil enzymatic activities analysis
2.4 Statistical analyses
Chapter Ⅲ Responses of milk vetch to P and K application
3.1 Plant shoots and roots biomass
3.2 P and K uptake
3.3 Soil total nitrogen and mineral nitrogen
3.4 Soil available P and K
3.5 Soil enzymatic activities
3.6 Correlation between soil enzymes and soil properties
3.7 Summary
Chapter Ⅳ Accumulations of biomass and P, K in different green manure crops in different paddy fields
4.1 Plant above-ground biomass accumulation
4.2 Shoots P and K accumulation
4.3 Summary
Chapter Ⅴ Effects of planting green manure crops on soil enzyme activities and soil nutritional properties in different paddy soils
5.1 Soil enzyme activities
5.2 Soil nutritional properties
5.2.1 Soil organic matter and total nitrogen
5.2.2 Soil mineral nitrogen
5.2.3 Soil available P and K
5.2.4 Soil pH
5.3 Summary
Chapter Ⅵ Relationships among soil enzymatic activities and soil properties under planting different green manures in different paddy soils
6.1 Relationship among P, K uptake and soil enzymes
6.2 Relationships among soil properties and soil enzymes
6.3 Relationships among green manure species and soil properties
6.4 Correlation among pH and available P, K concentration of the soil
6.5 Summary
Chapter Ⅶ Discussion
7.1 Milk vetch influenced by P and K fertilization
7.2 P and K accumulation in different green manures in various paddy soils.
7.3 Soil enzymatic activities differed in different paddy soils under plantation of different green manures
7.4 Relationships among P and K uptake, soil properties, and enzymatic activities
Chapter Ⅷ Conclusions, innovations, and prospects
8.1 Conclusions
8.1.1 Responses of milk vetch to P and K application
8.1.2 Performances of various green manures in different paddy fields as for P, K accumulation
8.2 Research innovation
8.3 Future research prospects
参考文献
致谢
FARHEEN
中国农业科学院;
