Effects Of Super Absorbent Polymers Dosages And Straw Mulching On Soil Water Dynamics And Development Of Flue-cured Tobacco In Rainfed Tobacco Field

In order to alleviate water shortage of tobacco field in the rainfed tobacco field of western Henan Province,The flue-cured tobacco variety Qinyan96 was taken as the research object,the effects of Super Absorbent Polymers dosages and straw mulching on soil water dynamics and development of flue-cured tobacco in rainfed tobacco field were studied in Wangcun,Luoning County,Luoyang tobacco-growing area.In order to study the suitable cultivation measures for rain-fed tobacco fields,provide technical support for the cultivation of flue-cured tobacco in rainfed tobacco fields.The main test conclusions are as follows:1.Soil moisture in 0-40 cm soil layer of rainfed tobacco field in western Henan is changes relatively greatly,40 cm below the soil moisture content is relatively stable,the growth of flue-cured tobacco mainly uses 0-40 cm soil layer of soil moisture.Super Absorbent Polymers and straw mulching can improve the soil water content of tobacco fields during the growth period of flue-cured tobacco,increase the storage capacity of soil,expand the capacity of soil moisture,enhance the drought resistance of flue-cured tobacco.Super Absorbent Polymers dosages and straw mulching could significantly reduce the tobacco field water consumption of flue-cured tobacco throughout the growth period,improv e the water use efficiency and water production efficiency of rainfed tobacco fields,can make more effective use of water of rainfed tobacco fields,could use limited moisture to create greater economic benefits,30kg·hm^-2of Super Absorbent Polymers with straw mulching and 45 kg·hm^-2of Super Absorbent Polymers with straw mulching have best effect.2.Super Absorbent Polymers and straw mulching can significantly improve the root volume of flue-cured tobacco in all periods,significantly improve the root activity of flue-cured tobacco,to ensure that the roots of flue-cured tobacco to maintain a strong vitality.With the increase of the amount of Super Absorbent Polymers,the root volume and root activity of flue-cured tobacco were also enhanced,30 kg·hm^-2 of Super Absorbent Polymers with straw mulching and 45 kg·hm^-2 of Super Absorbent Polymers with straw mulching have best effect.3.Super Absorbent Polymers and straw mulching can improve the Pn of tobacco leaves,changes the photosynthetic physiological factors in flue-cured tobacco leaves,and have little effect on the ecological factors of photosynthesis of flue-cured tobacco leaves.The daily variation of Pn of Super Absorbent Polymers and straw mulching treatment showed a single peak curve,Super Absorbent Polymers and straw mulching treatment can reduce the Vpdl and Tl of tobacco leaves,improve the Gs,Tr and Ci of tobacco leaves,due to temperature,Super Absorbent Polymers and straw mulching can improve the water use efficiency of tobacco leaves before 11:00,reduce the water use efficiency of tobacco leaves after 15:00.The results show that 30kg·hm^-2 of Super Absorbent Polymers with straw mulching and 45 kg·hm^-2 of Super Absorbent Polymers with straw mulching have best effect.4.Super Absorbent Polymers and straw mulching can increase the dry matter accumulation in roots,stems and leaves of tobacco plants,Super Absorbent Polymers mainly affects the dry weight of tobacco stem and leaf,straw mulching has a great influence on the accumulation of root dry weight.Super Absorbent Polymers and straw mulching can promote the distribution of dry matter accumulation of tobacco in leaves,reduce the proportion of dry matter accumulation in roots and stems,The dry matter accumulation of the tobacco plant was accumulated in the leaves with the water retaining agent 30kg·km^-2 + straw cover and the water retaining agent45kg·km^-2 + straw covered the highest.5.Super Absorbent Polymers and straw mulching can improve the yield,output value,average price and the ratio of high grade leaves and the other economic traits.Yield and output value of Super Absorbent Polymers 45 kg ·km^-2 with straw is the highest,the average price and the ratio of high grade leaves of Super Absorbent Polymers 30kg·km^-2 with straw is the highest.In summary,by the use of Super Absorbent Polymers 30 kg·hm^-2 with straw mulching the economic benefit could achieve optimal performance.