Research On Cultivation Techniques Of Overcoming Continuous Cropping Obstacle Of Brassica Oleracea L.

This studied from the cabbage continuous cropping obstacle of lacking trace elementsand accumulating pathogens in soil. Selecting cultivation measures that trace elementfertilizer and soil fungicide were supplied according to the amount of trace element lackingand the number of pathogens in soil to overcome cabbage continuous cropping obstacles. Thepurpose of this study was improved the yield and quality of growing cabbage in continuouscropping. The processing of applied the trace element fertilizerⅠ，trace element fertilizerⅡ，trace element fertilizerⅢ and soil fungicide in the soil and sprayed all those trace elementfertilizers on the cabbage leaves were set up in the experiment to compare the effect ofovercoming continuous cropping obstacle. The main results of research were as follows:1. The soil pH in land of cabbage continuous cropping in high mountains of Taibaicounty, cabbage continuous cropping and cabbage and squash rotation and rotationcontinuous cropping in Yangling plain respectively were6.61,7.28,7.45and7.33.And Soil ofYang ling was higher than the taibai mountain high plains, rotation higher than that ofcontinuous cropping inYangling. High mountain of Taibai was higher than Yangling plain,rotation of cabbage and squash than continuous cropping of cabbage or squash in the numberof bacteria. The number of fungi was opposite to bacteria. High mountain of Taibai washigher than the Yangling plain in the effective content of Cu、Fe、Mn、B. The effective contentof Zn、Fe、Mn、Ca、B were higher in continuous cropping of cabbage or squash than rotationthat two in Yangling. Compared to the standard vegetable fields, cabbage cropping soil inYangling has lower effective content of Cu, Zn, Fe, Mn and B and the lack of amountrespectively were0.2579mg·kg-1、0.4200mg·kg-1、9.5063mg·kg-1、24.0123mg·kg-1、1.4338mg·kg-1. And Taibai as well as lower and the lack of amount of Cu、Zn、Mn、Ca and Brespectively were0.0735mg·kg-1、0.9063mg·kg-1、17.3413mg·kg-1、0.0167mg·kg-1、1.0040mg·kg-1. So increasing right amount of trace element fertilizer in two kinds of vegetable fieldswill improve disease resistance and high quality and superior quality of cabbage.2. The disease rate and disease index of soft rot and black rot of “Lüqiu66” cabbagewere lower than the most serious control respectively11.5%,6.4%and6.24,1.56incontinuous cropping land by spraying trace element fertilizerⅡ.And disease resistance of thatreaches high resistance (HR) level.“Baihui” cabbage has the lowest disease rate and diseaseindex than control. The soft rot was decreased6.64%and4.02.And black rot was decreased8.89%and7.22. And disease resistance of that reaches resistance (R) level.3. Compared to controls, the growth potential of cabbages were enhanced by spraying trace element fertilizerⅡand trace element fertilizer Ⅲ. And plant height of cabbage was27.61cm，stem diameter was17.6667mm，plant width was48.36cm，max length and width ofleaf were respectively32.7cm and31.9cm, roots were strong in Yangling. In high mountainof Taibai, plant height was27.78cm, plant width were respectively reduced0.24cm and1.11cm than applied the trace element fertilizer Ⅲ in soil and control.4. Improved the quality of cabbage that under applying trace element fertilizer in fieldsof cabbage continuous cropping. And Texture was crisp and sweet was flavor on ball of leaves.Content of vitamin,crude protein and solubility sugar on “Lüqiu66” cabbage were179.5mg·kg-1、1.392mg·kg-1、553mg·kg-1respectively by spraying trace element fertilizerⅡ,andall of that were higher than control. By contrast,content of nitrate nitrogen was lowest, only203mg·kg-1. Soil fungicide has little effect on the quality and taste of cabbage, only mainly toimprove disease resistance of plants.5.Spraying trace element fertilizerⅡand trace element fertilizer Ⅲ could significantlyenhanced the compactness of cabbage ball and reduce the length of central axis.Under suchtreatments,the compactness of cabbage ball on “Lüqiu66” and “Baihui” cabbage wereincreased0.045g·cm-3and0.0239g·cm-3,the length of central axis were21.2%and18.64%,respectively.6. Applying the trace element fertilizer in the land of cabbage continuous cropping couldreduce the number of outer leaves of cabbage plants and also petiole-leaf ratio, but increasethe weight of ball also improve yield. Yield of “Lüqiu66” cabbage was69529.4kg·ht-2andincreased39.96%than control after spraying trace element fertilizerⅡ. Yield of “Baihui”cabbage was677821.7kg·ht-2and increased24.61%than control after spraying trace elementfertilizerⅢ.