Effects of Organic Matter Application Rate on Yield and Nitrogen,Phosphorus and Potassium Nutrient Absorption and Utilization in Potato
To investigate the features of potato nutrient absorption and utilization(nitrogen,phosphorus,and potassium)after adding organic matter,two experimental sites with significant variations in basal fertility were selected.Five organic matter dosage levels were established:0(T1),975(T2),1950(T3),2925(T4)and 3900 kg/ha(T5),with no fertilizer application(T0)serving as the control.The medium-late ripening variety Qingshu 9 was used to examine soil nutrient content,microbial population,potato yield,dry matter accumulation and nutrient absorption and utilization.The results showed that the increase of organic matter could effectively improve the soil nutrient content and soil microbial population.With the increase of organic matter,potato yield,nutrient accumulation,nutrient utilization rate,fertilizer contribution rate,partial factor productivity and soil bacteria to fungi ratio showed increase first and then decrease,and all of them were higher in the high base fertility experimental site than those in the low base fertility.The highest potato yields were obtained when 975 and 1950 kg/ha of organic matter were applied in the experimental site of Xiema(with high base fertility)and Jianshan(with low base fertility),which increased yield by 11.84％and 8.22％compared with T1 treatment,respectively.Overall,there was a greater noticeable impact of organic matter on fertilizer utilization rate,partial factor productivity and fertilizer contribution rate.A higher yield of potato is more likely to obtain in relatively high soil fertility.Adding too much or too little organic matter is not conductive to the nutrient absorption and yield formation of potatoes.
PotatoOrganic matterNitrogen,phosphorus and potassium nutrientNutrient absorption and utilizationYield
NETL
NSTL
万方数据
