Effect Of Slow Release Urea On The Yield, Quality Of Pepper And Soil Environment

In this experiment, pepper varieties "long Jiao2" as tested material, research oneffects of slow release urea on soil microbial quantity of pepper, soil enzyme activity,dynamic changes of soil nutrients, pepper yield, quality, the content of chloropHyll,fluorescence parameters etc. The following results were obtained:1. Slow release urea D1802and D1804in growth period of pepper, can maintainhigher number of soil fungi, D1803and U3in growth period of pepper can keephigher.number of soil bacteria and actinomycetes2. With increasing fertilization time, application of slow release urea treatmentThe number of the soil type anaerobic nitrogen fixing bacteria emerged first increaseand then decrease, and the number of soil type anaerobic nitrogen fixing bacteria intreatment with urea showed decreasing, the D1803and D1804can maintain thenumber of anaerobic nitrogen fixing bacteria high type in the pepper growth period.D902, D1802and D1804can keep the higher amount of soil aerobic nitrogen fixingbacteria in the largest type of hot pepper nutrition needs.3. With the increase of fertilization time, the number of pepper soil denitrifyingbacteria increased gradually. Urea treatment group compared with treatment whichapplication of slow release fertilizer, did not good at inhibition for denitrifyingbacteria growth. In the application of slow release fertilizer treatment group, D1803obvious inhibition denitrifying bacteria exhibited, in the three periods of afterfertilization30days,60days and90days, the number of soil denitrifying bacterias isthe lowest. In addition, the treatment D1804also showed better inhibition on soildenitrification bacteria growth. D1803can obviously inhibit the nitrification bacteriabreeding, in the growth period of pepper, the number of soil nitrifying bacteria is thelowest.4. At the early time of fertilization, urea treatment has high efficiency ureanitrogen content in the soil fertilization, and then gradually declined; Afterfertilization60days, the treatment D90application of slow release urea, soil availablenitrogen content is the highes; treatment application of slow release D180availablenitrogen content in soil is lower in30d, as the fertilization time prolonging the soilavailable nitrogen content increased gradually. On the110days, the soil availablenitrogen content in D1803is higher than the ordinary urea treatment200%. Slowrelease urea D1804higher than U4210%. In the maintenance of soil availablenitrogen content is best. 5. In the whole test period, equal amounts of urea treatment, urea treated soilurease activity was higher than slow urea treatments, slow release urea treatmentssignificantly inhibited the activity of soil urease, the treatment D1803and D1804havethe best effect. Soil alkaline phosphatase and catalase showed no significantdifference in the growth period of pepper between each treatment.6. Compared with urea treatment, the same amount of nitrogen release urea soilEC values were lower, in two kinds of slow-release urea treatment, the soil EC valueof D180are lower than the D90treatment.7. During the growth of the pepper, soil pH value decreased first and thenincreased, but between each treatment, the soil pH value has not significantlydifferent.8. Compared with the same amount of nitrogen fertilizer, slow release urea couldsignificantly increase the content of chloropHyll, leaf under the light of the actualquantum yield, electron transfer rate, maximum pHotosynthetic quantum yield,pHotosynthetic rate, pHotosynthetic accumulation, and two treatments group D1803,D1804have the best effect on improving the chloropHyll content and fluorescenceparameters.9. On the same urea fertilizer level, application of slow-release urea couldsignificantly increase the content of Vc, content of soluble protein, soluble sugar,reducing sugar and soluble starch content in pepper, and can effectively reduce thecontent of nitrate nitrogen in pepper, to improve the quality of the pepper. Applicationof slow-release urea could significantly increase the yield of pepper, D1803andD1804two groups treated with the highest either yield or pepper yield. Have the besteffect in promoting of pepper yield.In summary, treatment1803and D1804to improve the yield, quality, soilnitrogen use efficiency and soil has a significant effect of denitrifying bacteria andreduce soil urease activity of anaerobic nitrogen fixing bacteria quantity and reducesoil type.