Abstract: Study on effect of NPK fertilizers on nutrient uptake and dry-matter accumulation and yield components of red kidney beans, which could provide the theoretical basis for rational fertilization and efficient production of red kidney bean. This experiment was based on the Yingguohong red kidney bean as materials, field fertilizer experiment with nitrogen (N), phosphorus (P) and potassium (K) nutrient deficiency, collecting plant samples at full growth stage, measuring nutrient content, dry matter accumulation and yield constitute factor data. The results showed that the nitrogen, phosphorus and potassium fertilizer had significant effect on the yield of red kidney beans. In the yield component factor, 100 grain weight had the greatest influence on the yield formation. Nutrient limiting factors affecting yield was N > P > K. It could be seen from the unit content of N, P and K, N fertilizer had the greatest influence on the leaves, P fertilizer had the greatest influence on grain, K fertilizer had the greatest influence on the stem and pod skin.There was a clear reflux phenomenon in the mature period of N fertilizer. The accumulation amounts of red kidney bean plants during the whole growth period of N, P and K increase, the accumulation amount reached 161.15, 38.27, 126.70 kg/ha, the ratio was 4.21:1.00:3.31. The apex of N accumulation occured from early flowering period to full bloom stage, P and K appear from full bloom stage to pod bearing stage. The vegetative organ was the distribution center of dry matter accumulation on front stage of growth, dry matter accounted for 72.22% of the total. The reproduction organ was the distribution center of dry matter. Accumulation on later stage of growth, dry matter accounts for 70.26% of the total. The accumulation rate of dry matter was in the shape of a parabolic line on all growth period, from full bloom stage to pod bearing stage reached its peak. The accumulation of single plant was 0.952 g/d. The peak of the accumulating rate of each organ was different, root and leaf in early flowering stage, stem and pods in the full bloom stage, pod and grain in the pod bearing stage. The correlation coefficient between nitrogen accumulation and drymatter accumulation was 0.95 and 0.96 on pod bearing stage and mature stage, the performance was extremely remarkable. The correlation coefficient between phosphorus accumulation and drymatter accumulation was 0.93 on pod bearing stage, the performance was extremely remarkable. The correlation between potassium accumulation and drymatter accumulation was not remarkable. The correlation coefficient between pod number and drymatter accumulation of red kidney bean on early flowering stage was 0.95, the performance was extremely remarkable. The correlation coefficient between 100-grain weight and dry matter accumulation on pod bearing stage was 0.94, the performance was extremely remarkable. The correlation coefficient between yield and dry matter accumulation on full-bloom stage was 0.86, and the performance was remarkable. On pod bearing stage was 0.98, and the performance was extremely remarkable. The dry matter accumulation in the reproductive growth stage was the key factor affecting the yield results.

Key words: Red kidney bean, NPK fertilization, Nutrient absorption, Absorption rate, Dry-matter accumulation, Yield factors

CLC Number: 

• S318

• S143