Screening of Soybean Varieties Suitable for Silage Maize-Forage Soybean Intercropping Model
[Objective]The aim of the present study was to screen the soybean varieties suitable for silage maize-forage soybean intercropping model in the low plain areas of eastern Hebei Province.[Method]A total of 35 soybean varieties were selected as experimental materials.Each variety was planted in a 35 m2(5 m×7 m)plot,with 10 cm plant spacing and 40 cm row spacing,and planting density of 170 000 plants/hm2.The plots were randomly distributed and repeated three times.The time for flowering,pod setting and grain filling stages of all the soybean varieties was recorded and their growth periods(the number of days from sowing to grain filling stage)were calculated.The soybean were harvested at grain filling stage with fresh weight yield measured.Five soybean plants were randomly selected from each plot and variety,with contents of crude protein(CP),acidic detergent fiber(ADF),neutral detergent fiber(NDF),crude ash(Ash)and crude fat(CF)measured after deactivation,drying and crushing.The entropy weight TOPSIS comprehensive evaluation function in SPSSAU software was used to comprehensively evaluate and rank the feeding quality of all the soybean varieties,and a comprehensive analysis chart for the comprehensive evaluation and ranking of the growth period,fresh weight yield and feeding quality of various soybean varieties was created.[Result]Ruidou No.1 had the longest growth period of 100 days.The growth periods of You 6019,Jindou 99 and Andou 109 reached 97 days,and that of Pudou 5110 was 95 days.The growth periods of Zhonghuang 78,Beidou 17,Beidou 30,Fengdou No.3 and Lindou No.10 were the shortest,only 85 days.Suike 23(40.48 t/hm2),Suike 9(38.34 t/hm2)and Hedou 12(38.06 t/hm2)were the three varieties with the highest fresh weight yield.Sudou 16(10.29%)had the highest crude ash content,followed by Jindou 99(9.80%),Suike 9(9.76%)and Shengdi No.1(9.57%).The crude protein contents of Wandou 37(29.17%)and Jiakedou No.1(25.38%)were significantly(P＜0.05)higher than the other varieties.The crude fat contents of Andou 109(6.33%),Fengdou No.3(5.93%)and Wandou 15(4.97%)were significantly(P＜0.05)higher than the other varieties.The ADF contents of Fengdou No.3(24.05%),Lindou 10(24.38%)and Wandou 37(24.46%)were significantly(P＜0.05)lower than the other varieties.The NDF contents of Suike 12(31.52%),Jindou 99(32.82%)and Pudou 5110(33.39%)were significantly(P＜0.05)lower than the other varieties.The top five soybean varieties in the comprehensive evaluation of feeding quality were Jindou 99,Pudou 5110,Andou 109,Suike 12 and Wandou 37.The comprehensive analysis chart based on the overall evaluation and ranking of the growth period,fresh weight yield and feeding quality of different soybean varieties showed that four soybean varieties,Ruidou No.1,Andou 109,Pudou 5110 and Jindou 99,performed well in all the three aspects.[Conclusion]Ruidou No.1,Andou 109,Jindou 99 and Pudou 5110 could be used as candidate varieties for silage maize-forage soybean intercropping model in the low plain areas of eastern Hebei Province.
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