The Pakistan Journal of Agricultural Sciences · 2009 · 55 citations · 3 references
AgricultureAgronomyCrop SciencesCrop PhysiologyCrop ProductionPlant NutritionCrop Nutrient RequirementsCrop NutritionNitrogen NutritionNutrient AvailabilityPhosphorus ManagementPhosphorus NutritionPhosphorus RequirementPhosphorus Stress PhysiologyPhosphorus Uptake Efficiency
3
Official Methods of Analysis of
Analytical Chemistry · 1980 · 59.6K citations
Management, Educational Assessment, Information Retrieval +5