Study On The Nutrient Requirement Characteristics And Formulated Fertilization Of Ziziphus Jujuba Mill.cv.Lingwuchangzao

This paper studied on the effect of the different fertilizer treatment on growth,fruit quality,yield,soil nutrient,dry matter accumulation of jujube and regularity of nutrient absorption of N,P,K.Take Jujube cultivar ’Lingwuchangzao’ as experimental subjects,and carry out in ’Zhongxi’ jujube farm and’Qianm’ fruit and juice limited.Use ’3414’ formula fertilization program and the regularity of nutrient requirement.Select reasonable fertilization formula,reveal LingWu long regularity of nutrient requirement of jujube.The main research results are as follows:(1)The rate of dry matter accumulation was higher in the flowering stage and fruit expansion stage,so sufficient nutrients should be guaranteed before flowering and fruit expansion stage.Attaches great importance to the N,P,K basal application before,reduce phosphate fertilizer application after germination,fruit expansion period before the topdressing potash,fruit maturation topdressing nitrogenous fertilizer.After computing stages in germination fertilizing pure N,P,K were 25.059,8.93,12.98 g/plant,exhibition leaf stage fertilizing pure N,P,K were 69.38,28.18,57.77 g/plant,flowering stage fertilizing pure N,P,K were 86.48,30.83,66.25 g/plant,Pure N,P,and K were applied to 90.36,26.38,and 106.25g/plant during fruit expansion,and 79.63,42.23,and 111.99 g/plant during fruit maturity stage.(2)Rational application of nitrogen,phosphorus and potassium can promote the growth of’Lingwuchangzao’ also the chlorophyll content and fruit setting rate.In the whole growth period of jujube,the growth showed a trend of rapid growth first and then showed slow-growing.The treatment 6(N2P2K2)and treatment 8(N2P2K0)were best treatment for growth.Reasonable fertilization formula can also improve the fruit quality,which is beneficial to increase the Vc flavonoids,soluble sugar content and the length and diameter of the fruit,but organic acids conyent were decreased.The treatment 6(N2P2K2)and 8(N2P2K0)were best treatment for fruit quality.Formula fertilization can increase the content of soil organic matter,total nitrogen,total phosphorus,available nitrogen,available phosphorus and available potassium.Treatment 8(N2P2K0)and 9(N2P2K1)has remarkably improved soil available nitrogen,available phosphorus and available potassium.(3)Photosynthetic characteristics are usually reflected byPn,Tr,Gs,Ci,Vpdl et al.In this study,Tr,Vpdl and Gs were decreased with fertilizer processing,reduce water loss benefits plants growth and Ci.Ci affects the fixation of CO in the dark reaction stage of light and reaction,thus affecting the photosynthetic rate,the photosynthetic efficiency of Jujube cultivar ’Lingwuchangzao’ were improved by the treatment 5(N2P1K2)and 6(N2P2K2).(4)The optimal fertilization combination test was obtained:6(N2P2K2)and 8(N2P2K0).Based on the two regression equation,the best application amount of N,P,K fertilizer(N,P2O5 and K2O)is 231.15 kg/hm,279.35 kg/hm2 and 66.55 kg/hm2,providing the best yield is 5070.91 kg/hm2.Compared with each treatment,the yield increase of 6(N:P2O5:K2O=1.84:2.01:1)was the best,the yield was 5217.065 kg/hm2,and the economic benefit was 35637.34 yuan/hm2.The amount of fertilizer is only applicable to the test of owned land,can be used as the recommended fertilizer amount of’Zhongxi’ jujube farm.