Introduction and Cultivation of Protein Mulberry in Wind-sand Area of Northern Shaanxi and Its Adaptability Analysis
In order to study the adaptability of different protein mulberry varieties in the windy and sandy area of Yuyang in northern Shaanxi,four different ecotypes of three-year protein mulberry('Yuyinsang-1','Yuyinsang-2','Yuyinsang-3'and'YuYinsang-4')were used as materials.The adaptability of four kinds of protein mulberry was comprehensively evaluated from agronomic traits,physiological and biochemical characteristics,yield characteristics and quality.The results showed that the four kinds of protein mulberry had good overwintering performance and could overwinter safely in Yulin area.The agronomic characters of'Yuyinsang-1'were better than other varieties(P＜0.05).The analysis of physiological and biochemical characteristics showed that there were significant differences(P＜0.05)in chlorophyll content,net photosynthetic rate(Pn)and instantaneous water use efficiency(WUEi)among the four mulberry varieties except transpiration rate(Tr).The chlorophyll content and Pn of'Yuyinsang-1'were the highest,while the WUEi of'Yuyinsang-1'and'Yuyinsang-4'were the best.The yield analysis showed that there was no significant difference in the total yield among the four protein mulberry varieties,but there were some differences in the fresh weight of stem and leaf,dry weight of stem and leaf and biological yield per plant.The best two varieties were'Yuyinsang-1'and'Yuyinsang-4',and the biological yield per plant of'Yuyensang-1'was significantly higher than that of the other three varieties(P＜0.05).There were no differences in crude fat content,crude fiber content and ash content among the four protein mulberry varieties,but there were significant differences in crude protein content,of which the crude protein content of'Yuyinsang-1'was the highest(194.9 g/kg),which were 1.19,1.43 and 1.13 times as much as'Yuyinsang-2','Yuyinsang-3'and'YuYinsang-4',respectively.The correlation analysis showed that the yield was significantly positively correlated with net photosynthetic rate,instantaneous water use efficiency,fresh weight and dry weight of stem and leaf(P＜0.05).The crude protein content was significantly positively correlated with plant height,chlorophyll content,net photosynthetic rate and fresh weight of stem and leaf(P＜0.01).The results of comprehensive membership function analysis showed that'Yuyinsang-1'could be used as a suitable protein mulberry variety in the sandy area of Yuyang in northern Shaanxi.
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