低量生物质炭对2种热带牧草产量和品质的影响研究初报

运用田间小区试验,设置3个处理(生物质炭与土壤质量(0~20 cm)比分别为0.1%,0.5%,1.0%),同时以不加生物质炭作为对照,研究生物质炭对王草(Pennisetum purpureum K.Scbumacb×P.typhoideum Rich)和柱花草(Stylosanthes guianensis SW.)2种供试牧草产草量和品质的影响。结果表明:与对照相比,各处理均对柱花草和王草产草量的影响不显著,0.5%的生物质炭对2种草品质无显著影响;0.1%的生物质炭显著降低了第1茬王草蛋白质的含量,1.0%的生物质炭的施用显著增加了第2茬柱花草粗灰分的含量。因此,低量生物质炭施用在海南花岗岩砖红壤对王草和柱花草生长无正面影响。

The Effect of Biochar on Grass Yield and Quality

This study investigates the effect of biochar produced by pyrolysis of wood on grass yield and quality for two forages(Pennisetum purpureum×P.americana cv.Reyan No.4 and Stylosanthes guianensis);and four rates of biochar(biochar/soil =0%,0.1%,0.5%,1.0%) analyzed in field trials.Results show that the yields of two forages have no significant differences among four rates of biochar.The quality of Pennisetum purpureum×P.americana cv.Reyan No.4 in the first cutting was significantly decreased with 0.1% biochar compared to control.The content of crude ash in the second cutting of Stylosanthes guianensis was significantly increased with 1.0% biochar treatment compared to control.Qualities of neither of the two forages show any significant differences between 0.5% biochar treatment and control.Therefore,the low rate of biochar(biochar / soil <1.0%) does not have positive impact on either yield or quality of two forages.