氮磷钾肥对紫云英产量及养分积累的影响

Effect of N,P,K fertilization on milk vetch growth,yield and nutrient accumulation

通过田间试验,研究了NPK肥对紫云英生长、产量及养分积累的影响。结果表明,NPK配施能促进紫云英生长,显著提高产量和养分积累量。NPK处理(施N 75 kg/hm2、P2O560 kg/hm2和K2O 60 kg/hm2)的紫云英茎数、株高和每茎复叶数分别是不施肥处理的3.77、1.81和1.60倍,是施PK处理的2.19、1.23和1.16倍,是施NK处理的2.11、1.16和1.11倍,是施NP处理的1.44、1.19和1.16倍。NPK配施的鲜草产量分别比不施肥、PK配施、NK配施及NP配施处理增加26.47、14.22、7.18和10.74 t/hm2。不同施肥处理都能使紫云英的养分积累量显著提高,其中NPK配施处理的紫云英地上部N、P2O5、K2O和C的积累量最大,分别是不施肥处理的3.66、3.27、2.85和2.80倍。试验结果说明,合理施用N、P、K肥能明显促进紫云英的生长,提高产量和养分积累量,有利于提高紫云英种植效益。

The effect of nitrogen （N）, phosphors （P） and potassium （K） application on growth, yield and nutrient accumulation of milk vetch （Astragalus sinicus L. ） were studied in this experiment. Results showed that combined application of N, P and K fertilizers could increase milk vetch in growth, yield and nutrient accumulation. The stem number of NPK （75 kg/hm^2 N, 60 kg/hm^2 P2O5, 60 kg/hm^2 K2O） treatment were 3.77, 2. 19, 2. 11, 1.44 times, plant height of NPK treatment were 1.80, 1.23, 1.16, 1.19 times, compound-leaf number of NPK treatment were 1.60, 1.16, 1.11, 1.16 times of those of no fertilizer, PK, NK, NP treatments, respectively. The fresh forage yield of NPK treatment increased by 26.47, 14.22, 7. 18 and 10. 74 t/hm^2 more than those of no fertilizer, PK, NK, NP treatments, respectively. The results also showed that NPK combination significantly improved N, P2O5, K2O and C accumulation in milk vetch, and total uptake amount of N, P2O5, K2O and C were 3. 66, 3. 27, 2. 85 and 2. 80 times of those in no fertilizer treatment, respectively.