| There existed many problems with Shatianyou. Too many seeds, less juice, unsatisfied fruiting with self pollination, poor natural fruit set, varieties degeneration resulting from improper measure of breeding, poor fruit quality and low commodity rate caused by improper fertilizing and early harvesting had affected the commodity value and the competitiveness of Shatianou fruits in the international market. An integrated measure of cross-breeding, properly fertilizing, pruning, fruit bagging and postponing harvest was applied in this study to improve the Germplasm and increase the fruit quality.Referenced theory was obtained for further breeding and variety improving of Shatianyou by breeding and selecting of the hybrid offsprings of Shatianyou×Jintang seedless pumelo, observing and mensurating the growth amount of plants, leaf shape, juvenile period, anthesis, fruit weight, fruit shape, flesh color, total soluble solid content, seed number, embryo characteristics and the flavor of the fruits of hybrid F1 and analyzing the tendency of inheritance of all the economical characteristics mentioned above. A integratedcultivation method of Properly fertilizing, pruning, fruit thinning, fruit bagging and harvest postponing was applied to improve the inner and apparent quality of Shatianyou fruits. The results of the study showed that:1, The average weight per fruit of hybrid was 731. 37g, being 1165g smaller than mid-parent value. The total soluble solid content for fruits of hybrid was 9.18%, being 10% lower than the average value of parents. And there was an obvious reduction in non-additive effect and degeneration. The average seed number per fruit of hybrid Fl was 67. 47, being 59. 5 more than that of fruits from the parents. There were 6 individual plants showed an average seed number per fruit below 20, and 9 seeds per fruit being the lowest. The amount of edible portion of a hybrid fruit was 55. 72%, showing 0.12% higher compared with 55. 6% of the average value of parents.2, It was found that there were 4 kinds of fruit shape. Round, elongated round, non-regulate shape and pear shape accounted for 23. 3%, 26. 7%, 43. 35% and 6. 6%, respectively. Except for only one plant of hybrid produced matured fruits of orange in color, other fruits of hybrid had the same color as the parents did, showing yellow in color.3, There was an obvious reduction in the thickness of the fruit rind. There were two kinds of flesh. One was pink in color of mutation;another was milky-white of parent' s type. All seeds of hybridprogenies were mono-embryo.4, The fruits of hybrid matured earlier than those of parents, readyto being harvested at the beginning of October.5, A prospective hybrid plant was selected, which had thecharacteristics of thin rind, juicy, fewer seeds, pink flesh,moderate acid sugar ratio and easy peeling.6, Flowering and fruiting were stimulated by means of cutting backafter harvest. It also benefited the control of diseases and pest,increased the apparent quality and the degree of uniform of thefruits.7, The number of the speckles on the fruit surface from all treatmentsreduced significantly. Treatment of single-layer paper bags showedthe best result, having 3 speckles fewer than control on the surfaceone fruit. There was not any fruit get rotted 60 days after stored.There was no while other qualities did not show No different was foundabout other qualities between the treated fruits and controlledfruits.8, The yield and the commodity rate were increased by means ofpollination of flower selecting and fruit number controlling. Theweight per fruit, the yield per tree and the commodity rate were thehighest when the fruit number per tree was controlled at the rankof 80 to 100 with a leaf to fruit ratio of 260 to 300:1. 9, The water content in the flesh, the total soluble solid content, the Vc content and the soluble sugar content were higher than control when self-made nutrition fertilizer was applied. But there was no any difference in the acid content between treatments and control. 10, Postponing harvest obviou...
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