Continuous Cropping Influence To Tobacco Output And Quality

In order to identify the influence's reasons and mechanisms, propose effective reasonable improvement technology and provide the basis to unify the land-using and land-fertilizing, the soil and other agricultural resource to be disposed reasonably. The methods of field test and data analysis were used to investigate two different level's exerted nitrogen tobacco leaves which were grown by continuous cropping and rotation cropping. The investigation is involved the physics and chemistry nature about tobacco growth, production, quality and the different depths of grown soil.The results of this study indicated that,1) The continuous cropping influences the soil's chemical property obviously. The continuous cropping soil's PH value is obviously lower than that of the rotation cropping soil. The surface layer soil's acidified degree is more serious, in the continuous cropping soil's effective phosphorus and the effective potassium content are higher than the rotation cropping soil obviously, the soil's PH value the organic matter of rotation cropping are higher than those of Con. Cropping. The content rises of phosphorus and effective phosphorus are the most of all. The potassium, effective potassium follow.At the same time, the discharge nitrogen's quantity is also influential to the soil chemical composition, and the great influence is to the PH value and the entire nitrogen content. Soil nitric nitrogen in soil accumulation and nitrogenous fertilizer amount used related. After experimental proof, the soil synthesis nutrition factor is more important to the leaf tobacco quality's influence, only the fertility moderate soil can produce the yield to be high and quite high quality leaf tobacco.2) The continuous cropping affects the height and the encircles of smoke stem, the leaf area, the soma, the output, the output value and so on, economic indicator key aspect. A continuous cropping smoke performs for the stem height, the stem encircles, the biggest leave with small area, the soma slowly accumulating, the output slightly, the most to be low slowly, the output value drops, the economic interest suffers injury. The amount of ammoniates applied influences the stem organs'growth, but this experiment can't proof the better rule. What may be affirmative is it is not true that more ammoniate makes stem organs grow better.3) The continuous cropping has the obvious influence to the output of the tobacco leaf. The continuous cropping has very great influence to the flue-cured tobacco product quality and the economic efficiency. The rotation cropping area has definitely bigger proportions in yield per mu superior and medium smoke than those in the continuous cropping area. The manifestations which are influenced by the continuous cropping to the tobacco quality can be known, first, higher nicotine and chlorine content, lower potassium. The aroma quality of the continuous cropping tobacco is more exquisite, aroma quantity is better. flavor is clean and more comfortable, offensive odor, irritation and total scores is obviously lower.4) In the continuous cropping area K346 has the better height and the encircles of smoke stem, the biggest leave with larger area, higher yield and superior and medium smoke, of course,better economic interest than Yun 85.Compare K345 with Yun 85, K345 is a better tolerance variety in the continuous cropping.