Effects of different sowing rates and row spacings on agronomic traits,seed setting traits and yield of Vicia sativa
In order to clarify the optimal sowing amount and row spacing for the local Vicia sativa line planting in the south of Henan Province,a two-factor experimental design was used to study the effects of different sowing rates and row spacings on the growth and development,fresh grass,straw and seed yield of Vicia sativa.Three sowing rates and four row spacing levels were set up respectively,so as to provide scientific theoretical guidance for improving the high-yield cultivation technology of Vicia sativa in actual production.The results showed that when the sowing rate was constant,the plant height,fresh and dry weight per plant showed a trend of first increasing and then decreasing with the increase of row spacing,and the maximum value was obtained when the row spacing was 30 or 40 cm;The stem diameter and branching number showed a gradually decreasing trend with the increase of row spacing,and both reached the maximum value at 20 cm row spacing.When the row spacing was constant,plant height and SPAD value increased gradually with the increase of sowing rates;Stem diameter and branching number decreased gradually with the increase of sowing rates.The optimal row spacing for seed setting traits were sowing rate 18.75 kg/hm2 with 30 cm row spacing,sowing rate 26.25 kg/hm2 with 30 cm row spacing and sowing rate 33.75 kg/hm2 with 40 cm row spacing.The yield of seed,grass and straw of Vicia sativa under different sowing rates and row spacings was significantly different(P＜0.05).The highest seed yield was 3753 kg/hm2 with sowing rate of 26.25 kg/hm2 and row spacing of 30 cm,the yields were 3468 and 3436 kg/hm2 followed with sowing rate of 33.75 kg/hm2 row spacing with 40 and 30 cm respectively.The highest yield of grass and straw was 35910 and 16878 kg/hm2,respectively,with sowing rate of 33.75 kg/hm2 and row spacing of 20 cm,followed by sowing rate of 33.75 kg/hm2 with 30 cm row spacing of and sowing rate of 33.75 kg/hm2 with 40 cm row spacing.The yield was 26761 and 13052,23662 and 12127 kg/hm2,respectively.To sum up,in order to harvest the yield of grass and straw,the optimal sowing rate was 33.75 kg/hm2 with 20 cm row spacing,the sowing rate of 26.25 kg/hm2 with 30 cm row spacing was optimal selected for the harvested seed yield.
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