In order to find out the solution for the problem of heavy cows liver field,such as slow growth in the early days,low fertilizer utilization rate,we conducted a soil improvement experiment by mixing sand to soil in cows liver field.The results showed that mixing sand to heavy cows liver field could change soil texture,effectively improve growing environment of tobacco plant,improve the speed of growth tobacco plants,and improve the yield and the value of tobacco,thus it is worthy of popularizing.

成熟度是影响烟叶品质最重要的因素之一,掌握好各部位烟叶的成熟度是提高我国烟叶品质的关键措施。以鲜烟叶淀粉含量变化为依据,根据鲜叶淀粉含量达最大值前或后采收天数作为界定不同部位成熟时期,描述烟叶田间外观特征,并结合烟叶产、质量效果,确定各部位最佳成熟采收的田间特征标准。

When tobacco is growing in the farmland,the nitrogen form is mainly ammonium and nitric in the process of fertilizing,the attitude on the effect and proportion using in the farmland is different.The research for the effect on the yield and quality of tobacco by using different proportion of ammonium nitrogen and nitric nitrogen shows that :in the same nitrogen amount,if only fertilize ammonium nitrogen,tobacco will grow better,the leaf is too thick and become yellow slowly,and If just fertilize nitric nitrogen,tobacco absorbs and grows too fast,nitric nitrogen is easy to lose.and tobacco is shorter and smaller,leaf is relatively small,become yellow fast.So if use proper proportion between them,the tobacco will grow fast in earlier stage,Nutrition is sufficient on later stage,the top leaf is fully spreaded,and it is even to become yellow,evidently bed,toast performance to improve,the ones that can promise yield,quality.

由于各地生态条件、土壤品种有很大差异,有机氮和无机氮的配合使用比例也应不同。在烤烟大田生育期采用不同的配比试验,研究其对烟叶产量质量的影响,结果表明:在本试验设计范围内,随着无机氮的提高,烟株长势增强、产量增加;随着有机氮的提高,烟叶内质、均价、上等烟比例有增加趋势。单纯施无机氮或单纯施有机氮都会限制产量、质量的提高。