Effect Of Calcium And Zinc Bag Controlled-release Fertilizer On Nutritional Status, Growth And Fruiting Of Peach Trees

Bag controlled-release fertilizer is a new type of controlled-release fertilizer designedaccording to the big individual volume characteristic of fruit trees. It uses bag to control therelease of nutrients. Pointed to the question that physiological disease happed serious infruiter produce and lacked the high efficient technique of supplying calcium and zinc, we tookthe technique of bag-controlled fertilizer applying production and application of calcium andzinc fertilizer. We studied the release characteristic of different bag-controlled calciumfertilizer and zinc sulfate bag-controlled release fertilizer. Meanwhile, the effect of differentbag controlled-release compound fertilizer comprised calcium on calcium nutritional status ofpeach trees and that of zinc sulfate bag-controlled release fertilizer on zinc nutritional statusof young peach trees were studied. The results showed as follows:1. The standard design bag fertilizer comprised calcium with five-line micro hole and100gweight compound could release more than80percent of all the containing nutrients after180dof soil application. The nutrient release concentration of zinc sulfate bag-controlled releasefertilizer was above80%in105d. So they both could meet the nutritional requirements ofpeach trees in growing season.2. Under greenhouse cultural condition, the young peach plants of BCRF1treatment (urea,calcium ammonium and nitrate and potassium sulfate blended), BCRF2treatment (calciumammonium and nitrate, ammonium dibasic phosphate and potassium sulfate blended) andBCRF3treatment (calcium ammonium and nitrate and potassium nitrate blended) grew betterthan CK treatment of fertilizer broadcast application in none. There were no significantdifferences of the total calcium concentration of the three treatment plants. Potassium nitratein the formula of BCRF3was hard to widely use because of its high price and inflammableand explosive character. So the treatments of BCRF1and BCRF2were chosen to experimentin orchard.3. Compared with the treatment of fertilizer broadcast application in none and two times,the calcium concentration of soil in root area, leaves and fruits of the two bagcontrolled-release treatments were increased, respectively. The SPAD value and Pn were alsohigh. Firmness of peach fruits under treatment of bag controlled-release compound fertilizercomprised calcium was also higher than other treatments. Firmness of peach fruits of BCRF1 treatment increased8.13%than CFS1-Ⅱtreatment and CK treatment. It reached5%significant level. Under the experimental orchard condition, BCRF1comprised no phosphorusfertilizer had better calcium supplement effect than BCRF2comprised phosphorus fertilizer.4. Zinc sulfate bag controlled-release fertilizer designed by five-line micro hole and20gevery bag was studied in orchard. The results showed that nutrient release concentration ofzinc sulfate bag controlled-release fertilizer was above80%in105d and could satisfy thedemand of zinc nutrient in peach all over a growth season. Compared with the fertilizerspread in none and two times treatments D(ZnSO440g per tree)、E(ZnSO460g per tree) andF(ZnSO480g per tree) in orchard, the zinc concentration of soil in root area and leaves of bagcontrolled-release treatments were improved, respectively. The N、P and K concentration andPn of leaves were all high. The experimental result of A(2bags per tree)、B(3bags per tree)and C(4bags per tree) do not have much differences.