Abstract:

Abstract In the tobacco-rice rotation district of southern Hunan, which is a high-quality tobacco leaf producing base, we achieve good results when using two kinds of rice straw to field methods for 3 consecutive years, to study the dynamics of soil available nutrients in tobacco fields, tobacco yield and quality, and late rice yield. The results show that rice straw to field can significantly increase soil available N, P, K nutrients, promote tobacco plants’ absorption and utilization of N, P, K nutrients. Compare the two kinds of rice straw to field methods, the release of tobacco field soil available N, P, K is in this order: Rice Straw Turning Pressure ≥ Rice Straw Mulching＞Control. Three years tobacco yields statistics: Rice Straw Turning Pressure and Rice Straw Mulching yields increase 14.1% and 8.0% on average, when comparing to Control respectively; and the second and the third years’ effects are better than the first year’s. The basic internal components of tobacco tend to be reasonable with 90% high and medium quality tobacco leaves. Late rice yields statistics: To conventional rice yield, Rice Straw Turning Pressure area and Rice Straw Mulching area’s yields increase 83.3% and 45.8% on average, when comparing to Control respectively. To hybrid rice yield, Rice Straw Turning Pressure area and Rice Straw Mulching area’s yields increase 13.6% and 12.3% on average, when comparing to Control respectively.