土壤磷素分布  soil phosphorus distribution

土壤磷素分级方法  soil phosphorous fractioning methods

土壤养分分布  soil nutrient distribution

土壤养分分布图  soil nutrients distribution map

土壤养分分级  classification for soil nutrition

稻田土壤养分  paddy soil nutrient

根际土壤养分  rhizosphere soil nutrients

耕层土壤养分调查  investigation of topsoil nutrients

耕地土壤养分  farmland soil nutrients

森林土壤养分  forest soil nutrient

土壤N、P养分  Soil N and P nutrient

土壤磷分级  phosphorus fractions; Classification of soil phosphorus; Fractionation of soil inorganic phosphorus

土壤磷分级与测定  soil phosphorous fractionation and determination

土壤磷素  soil phosphorous; phosphorous situation in soil; Soil phosphorus; Soil; Fraction of phosphorus; Phosphorus; Soil phosphate; phosphorus of soil; soil p; 31P NMR; fractions of phosphorus; the water level fluctuating zone

土壤磷素变化  Transformation of soil P

土壤磷素活化剂  Soil phosphorus activator

土壤磷素平衡  Soil phosphorus balance

土壤磷素吸持作用  rice-based cropping system

土壤磷素状况  the status of soil phosphorus