稻壳掺播对土壤质地及烟叶生产的影响

皖南烟区土壤主要为水稻土,质地偏黏,不利于烟叶生长,为此,在宣城烟区耕作层土壤中掺播一定体积比例的稻壳,探讨其对土壤质地和烟叶生产的影响。结果表明:①随着掺播稻壳比例的增加,0.02～2mm的土壤颗粒和土壤有机质含量增加,土壤体积质量(容重)、含水量和pH降低,但这种趋势随着时间推移而逐渐减缓。②烟田耕作层土壤掺播稻壳总体上有利于烤烟生长,能够提高烟叶产量和品质,经济效益也明显提高。其中以掺播20%～30%的稻壳(稻壳体积/土壤体积)时烤烟的农艺性状、经济性状及工艺评价结果最佳。

Effects of rice-husk on soil texture and tobacco production

The texture of most paddy soil in South-Anhui is clayey, which is unfavorable for tobacco growth, thus, rice-husk was added into the cultivated-horizon of paddy soil to explore its effects on soil texture and tobacco production. The results showed that: 1) with the increase of added amount of rick-husk, the contents of 0.02-2mm soil particles and soil organic matter increased, soil bulk density, water content and pH decreased, but the tendency became slow down with time. 2) adding rice-husk generally can promote tobacco yield, quality and economic income, and adding 20%-30% (Vrick-husk/Vsoil) was optimal for tobacco production.