Application Of PPP₃₃₃ On Weeds In Pear Orchard

To control the growth of weeds, replace artificial mowing, reduce soil and watererosion, improve the soil physical and chemical properties, promote tree growth, increaseproduction and improve fruit quality, PP333 was used in pear orchard. Studied on different dosesof PP₃₃₃ on the growth and development of pear orchard, and studied on soil bulk density,temperature and humidity in central crown, and growth of pear, fruit yield and quality. Theresults showed that ground spraying three kind concentration of PPP333 may significantlyreduced the height of the growing weeds, substantial increased weed density and the amount inthe three kind weeds, crabgrass, barnyardgrass, green bristlegrass, the grass leaf length, widthand length of Crabgrass were significantly inhibited, edible amaranth and daisyfleabane, the twokinds of broadleaf weeds were inhibited less than grassy weeds, It also demonstrated that soilmoisture increased in different soil depth, permeability and decreased temperature, unit weight.There is no significant effection on air temperature and humidity in the central of the tree crown;increased the diameter of truck, inhibited the numbers of new shoots and the length of inter-node,the single leaf area was reducted, increased leaf weight, increased single fruit weight and yield,fruit size increased slightly, fruit soluble solids, total sugar and Vc content and hardnessincreased, but there was no significant impact on the ratio between sugar and acid.