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应用4种钙微肥及组合,于长富2号苹果初花期、幼果期和果实着色期各叶面喷施1次,比较其对苹果水心病的防治效果。结果表明:高效补钙宝与氨基酸钙效果较好,硝酸钙次之,与对照差异极显著或显著。恒温库贮藏半月后调查,喷施高效补钙宝、氨基酸钙和硝酸钙的病情指数和病果率分别为2.2和6.7%,4、4和13.3%、6.7和20.0%,对照分别为17.8和52.0%。贮藏5个月后的调查病情指数和病果率分别为12.8和38,4%、20.6和61.8%、34.3和66.8%,对照为48,2和95.4%。 相似文献
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于苹果幼芽萌动期、开花前1~2天、坐果期、幼果期、果实迅速膨大期和成熟前期喷施1000倍液苹果增产菌。经对幼果心室、萼筒分离培养表明:处理后果实心室和萼筒的有害微生物群落比对照少。成熟期和贮藏期调查表明:成熟期霉心病发病率可降低3.0%~10.0%,病情指数降低6.7%~33.2%;贮藏1个月后发病率降低10.0%~22.3%,病情指数降低15.6%~43.3%。 相似文献
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旱地果园秸秆覆盖可以使红星、新红星苹果树叶片的单叶面积分别增加9.29%和12.12%,鲜叶比重增加4.06%和8.23%,叶绿素含量提高14.38%和16.72%,叶绿素a/b比值提高2.27%和2.78%,从而为提高光合速率、促进树体生长发育奠定了基础,使叶片净光合速率分别比对照提高16.72%和18.82%。 相似文献
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Water (ψw) and osmotic (ψs) potentials were measured in leaves of irrigated and unirrigated Cox’s Orange Pippin apple trees on MM. 104 rootstock during the summer seasons of 1969 and 1970. Turgor pressure potential (ψρ) was assessed from the difference between and ψs.Intercept values for ψs derived from regressions of ψs on ψw reflected an increasing intracellular osmotic concentration throughout the season and an increasing ability of the trees to withstand environmental stress in respect to turgor. In 1970 ψs decreased about 5 bars from July to September.The slope relating ψs and ψw remained nearly constant after June and reflected the property of the leaf cells to expand or contract with increasing or decreasing ψw. Since the slope was similar throughout both seasons, a general relationship between ψw, ψs and ψp was evaluated, from which it was deduced that a diurnal decrease in ψw resulted from the sum of the depressions in ψ3 and ψρ in the ratio of 3 : 4.The rate at which ψw decreased with increasing evaporation demand appeared to be under stomatal control; the latter was maximal when ψν equalled the value of ψs at full turgor. The value of ψp at this point was about 8 bars. Further depression of ψw led to yellowing and dropping of the basal leaves of shoots and spurs—an effect only present in the unirrigated trees.Under moderate conditions of evaporation demand the effect of irrigation on ψw appeared to be negligible while the soil moisture tension within any part of the root zone remained within the tensiometer measurement range. When soil moisture stress became greater than this, irrigation maintained ψw at between 5.3 and 6.3 bars higher than it was in the leaves of the unirrigated trees. Subsequently, the unirrigated trees defoliated completely several weeks earlier than the irrigated trees. 相似文献
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春季干旱对金冠苹果不同部位叶片衰老和脱落的影响 总被引:1,自引:0,他引:1
春季不同部位叶片发育差异大.而且呈明显规律性.轻度干旱促进各类叶片成熟;严重干旱使长枝基部叶和短枝叶急剧衰老、游离氨基酸积累、内源乙烯大量释放、叶片脱落,但对长枝中部叶的发育影响不大;能促进长枝上部叶的成熟.可见,春季干旱落叶是衰老的结果.春季干旱,对不同部位叶片衰老和脱落的影响与其自身发育的差异有关,因此形成了春季干旱落叶的局部性. 相似文献
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断根和剪枝对盆栽苹果叶片光合蒸腾及WUE的影响 总被引:17,自引:0,他引:17
以5 年生盆栽苹果(Malus domestica Borkh/Malus hupenensis Rhed) 为试材, 研究了断根和剪枝等处理对叶片净光合速率(Pn) 、蒸腾速率(Tr) 、气孔导度(Gs) 、水分利用效率(WUE) 的影响及引起WUE变化的原因。结果表明, 断根明显提高了WUE , 处理后第2~42 天逐渐升高。同时, 断根后Tr、Gs 明显下降, 而Pn 和羧化效率(CE) 迅速恢复, 并在第7 天以后明显高于对照; 新根总数及叶片玉米素核苷(ZR)浓度则于第28 天后恢复至对照水平。剪枝使Pn、CE、Tr、Gs 及叶片ZR 浓度升高, 但WUE 只在28 d 后稍高于对照。断根结合剪枝后第2 天, Pn、CE、Tr 及Gs 下降; 21 d 后Pn 和CE 高于对照, 而Tr 及Gs 与对照相近, WUE 在后期稍有升高。分析认为, 断根通过降低气孔导度极显著地提高了叶片WUE , 剪枝则通过提高CE 而使WUE 升高。 相似文献
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试验设5个氮素水平处理,研究氮素与一串红叶片衰老的关系。结果表明:一串红生长前期,叶片叶绿素含量、可溶性蛋白质含量及SOD保护酶活性升高,但生长后期均持续降低;而叶片POD活性在全生育期内则持续增加。以Ca(NO3)2.4H2O(N)70 mg/100 gH2O(N70)处理为最好,能够有效地延缓一串红叶片衰老进程,促进其生长。 相似文献
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1989-1993年,在甘肃苹果产区采集红星或元帅品种病果和无症状果实,逐果取果心组织分离,获得30余个真菌分离物,以链格抱(Alternariaalternata)出现率最高,占51.3%;其次为粉红单端孢(Trichotheciumroseum)、棒盘孢(Corymeumsp.)、节孢状镰刀菌(Fusariumarthrosporioides)、狭截盘多毛孢(Truncatellaangustata)等,依次占11.8%、12.0%、8.9%、7.9%。每个单果大多是只能分离出一种菌,少数出现2一3种菌。不同症状的果实,出现的真菌种类不同,霉心果以链格孢出现率最高,占60%-80%;心腐果中链格孢出现率显著较少,占10%-30%;而粉红单端孢、节孢状镰刀菌、棒盘孢、狭截盘多毛孢等5种菌的出现率较高,占7.8%-25.5%。用果心不带菌的果实人工接种,对12种分离物进行致病性测定看出,不同菌株之间致病力有明显差异,致心腐的病菌主要有5种,分别是粉红单端孢、棒盘孢、节孢状镰刀菌、狭截盘多毛孢和一种不产孢的浅色丝状菌。链格孢主要致霉心症状。混合接种试验表明,如有几种真菌进入果心,则致病性强的一种首先占据优势,? 相似文献