Conservation Tillage Techniques Research On Slop Tobacco Field In Shizhu Country,Chongqing

In order to explore conservation tillage techniques in Shizhu tobacco field slope area,with yunyan87,effects of ridging mode and ryegrass cropping system on tobacco growth and development,soil physical and chemical properties,the water and soil loss,chemical components and economic characters of flue-cured tobacco by field experiment were studied.The results showed that:Cross slope ridging mode match between ridge planting perennial ryegrass can significantly increased the maximum width of leaf,the rest of agronomic characters' performance is insignificant,but it's roots,stems,leaves and whole plant dry weight accumulation decreased slightly;compared with longitudinal slope ridging,cross slope ridging helped to promote tobacco plant height,effective leaf number,leaf area increase and whole plant dry weight accumulation,but longitudinal slope ridging helped help improve flue-cured tobacco the maximum leaf length,maximum leaf width and largest leaf area;flue-cured tobacco agronomic characters and weight accumulation of ridging mode match between body planting perennial ryegrass and between room ridge and ridge body planting ryegrass were poor.Ridging mode match ryegrass planting patterns can reduce soil bulk density and improve soil porosity;Cross slope ridging mode match ryegrass planting patterns can improve the overall stability and quantity,the number of water-stable aggregates and aggregate stability;Longitudinal slope ridging mode match ryegrass planting patterns had decreased the total number of aggregates,but between room planting perennial ryegrass and between ridge body planting ryegrass increased aggregate stability,Longitudinal slope ridging mode match between ridge body planting ryegrass water stable aggregates better quantity and stability;and stability of the overall number of aggregates to Longitudinal slope ridging was better,and the number of water-stable aggregates and stability of Longitudinal slope ridging was better,but Longitudinal slope ridging mode match ryegrass planting patterns was better.Compared with longitudinal slope ridging,cross slope ridging effectively improved soil p H,organic matter,nitrogen,phosphorus and potassium content,and ridging mode with ryegrass was better.Compared Longitudinal ridging mode,soil,water and nutrient loss of cross slope ridging were lower in the whole field growth period,and water and fertilizer and soil conservation of ridging mode match ryegrass cropping system was betterThe middle and upper leaves' chemical composition of ridging mode match ryegrass cropping system can be improved and chemical composition of coordination under cross slope ridging was better.Cross slope ridging mode match ryegrass planting patterns can increase the content of petroleum ether extract of tobacco in different parts.Longitudinal ridging mode match between room planting perennial ryegrass can increase the content of petroleum ether extract of middle tobacco leaf,but was not conducive to improving other parts content of petroleum ether extract.Compared longitudinal ridging mode,petroleum ether extract content of longitudinal ridging mode match between body planting perennial ryegrass and between body and room planting perennial ryegrass had little difference;ridging mode had little effect on middle leaf petroleum ether extract content,and the upper leaf petroleum ether extract content of longitudinal ridging mode was higher than the cross slope ridging mode.Cross slope ridging mode match between room planting perennial ryegrass was not conducive to improving economic characters of flue-cured tobacco,but yield and output value of longitudinal ridging mode match between room planting perennial ryegrass can be increased 50.26%,53.10%;economic characters of cross slope ridging mode was higher than the longitudinal ridging mode,but economic characters of lon gitudinal ridging mode match ryegrass planting patterns was higher than the cross slope ridging mode match ryegrass planting patterns.Economic characters performance of ridging mode match between body planting perennial ryegrass and between room ridge and ridge body planting ryegrass was not ideal.Because after mowing ryegrass covered the ridge body,ryegrass root system had not been killed,some ryegrass secondary growth,resulting in effect of between room planting perennial ryegrass and between body ridge and ridge body planting ryegrass not fully played out,and then affecting the growth and development of flue-cured tobacco and economic benefits.Resolve this issue you can choose the appropriate agent to kill roots,but that need to be further improved in future research.