Eff1ects Of¹⁵N Application With Different Of Dripping Irrigation Programs On¹⁵N Absorption、Distribution And Utilization Of Apple

This article to open field cultivation of eight years of Kiazshi/Malus robustatest materials, field irrigation and fertilization test, analysis of the distributioncharacteristics of the apple orchard soil nitrate under conventional irrigation and dripirrigation conditions, clear apple drip irrigation conditionsPark field distributioncharacteristics of soil nitrate;the characteristics of absorption, distribution andutilization of¹⁵N-Urea with different numbers of drip irrigation emitters applied toeight–year-old Kiazshi/Malus prunifolia （Willd.） Borkh were studied;2-year-old RedFuji Apple/Malus hupehensis as test materials, using¹⁵N tracer technique to studythe different root distribution to set the emitter drops of¹⁵N2-year-old Fuji appleseedlings growth and¹⁵N-urea absorption, distribution and utilization characteristics.The main results were followed:1. Under field conditions, both through conventional and drip irrigation, fertilizationmethods, studied their apple orchard soil nitrate at different times and different levelsof the soil. The results showed that: both conventional and drip irrigation, Nfertilization on apple orchards at different times and different soil layers havesignificant impact fertigation N0-60cm soil layer in Apple changed significantly indifferent periods,60cm soil layers below gently changes between the upper and lowersoil nitrate content is relatively small. The conventional fertilization in the0⁴0cmsoil layer changed significantly between the upper and lower soil nitrate content waslarger. Two fertilization, apple orchard soil nitrate at different times bimodal form, with vigorous new shoots and fruit enlargement period of the highest. Compared withthe conventional fertilization, fertigation significantly eliminate the phenomenon ofsurface accumulation of nitrate, nitrate distribution in different soil layers morereasonable, more conducive to the absorption of apple root. Conventional fertilizationand fertigation in apple orchard soil on the distribution of N.2. The characteristics of absorption, distribution and utilization of¹⁵N-Urea withdifferent numbers of drip irrigation emitters applied to eight–year-old Kiazshi/Malusprunifolia （Willd.） Borkh were studied.The results show that the Ndff%values inplant organs are significantly different at fruit maturity with different numbers ofemitters, the Ndff%values with DF2are significantly higher than those of DF1andCK. The Ndff%values of fruits in all the three samples （or in3different treatments）are the maxima,3.84%,3.14%and3.16%, respectively, while the fruit Ndff%valuesat the shoot growing and fruit swelling stage DF2are lower than those of DF1andCK. At the fruit maturity stage, the highest distribution (of¹⁵N-Urea) is inreproductive organs and then in vegetative organs and storage organs, and there arenot significant differences between the treatments. The utilization of DF2¹⁵Nutilization is38.95%, and is significantly higher than those of DF1（27.68%） and CK（23.69%）. As the growth of the plants, the nitrate contents in the0-20cm and20-40cm soil layers show the same bimodal peaks which appear at the shoot growingand fruit swelling stages, and those of the60-80cm,80-100cm soil layers also showsimilar, mild trends. The soil nitrate contents in40-60cm soil layers are significantlydifferent, and the soil nitrate contents of DF2are significantly higher than those ofDF1and CK.3. Different dripper set of¹⁵N on the biennial Red Fuji apple seedling growth and¹⁵N-urea absorption, distribution and utilization characteristics affect the results: RedFuji apple shoot growth and root dry weight difference is significant, are40cm<20cm <30cm handle, the organ Ndff value differences,40cm handle various organsNdff value significantly lower than20cm and30cm handle, each handle spring shootsof prosperous long-term are coarse roots Ndff value; of spring shoots to stoplong-term root uptake of¹⁵N give priority to the functioning of organs of newborn nutrition; fall tree growing season, all treatments are coarse the root Ndff value thehighest, followed by fine roots and shoots of perennial branches, newborn vegetativeorgans （shoots, leaves） down to a lower level.40cm handle significantly reduce theplant¹⁵N utilization, significant differences in autumn shoot growth period,40cm,20cm and30cm3processing plants¹⁵N utilization were4.18%,6.09%and6.03%.Spring shoots of vigorous and fall growing season, the40cm shoots¹⁵N distributionrate was significantly lower leaves¹⁵N distribution rate was increased; of springshoots to stop long-term,40cm handle aboveground perennial stems and shoots of¹⁵N distribution rate significantly lower than20cm handle and30cm handle.