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驿新圆大枣枣头摘心试验初报 总被引：1，自引：0，他引：1
以驿新圆大枣为试材,对枣头进行不同时间、不同强度的摘心试验,结果表明:各摘心处理均有利于扩大树冠,培养结果枝组,提高产量.与对照相比,效果十分明显.其中,摘心枣头比对照坐果枣吊增加3倍,吊果比提高10倍;5月下旬至6月中旬摘心枣头比对照吊果比增加10倍,产量提高1倍;夏季摘心以留2～3个二次枝效果最好,当年形成的花量大,坐果多,产量高;摘心和夏剪结合可使树冠通风透光,减少养分消耗和病虫的危害,提高坐果率. 相似文献
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介绍了提高枣产量和果实品质的技术措施,根据生态条件选择适宜品种,依据栽培密度选择适宜树形;多施有机肥,根据物候期进行追肥;花期喷赤霉素、喷肥、喷水.进行环剥,提高坐果率;坐果后陆续采用叶面喷施、树干输液、氨基酸涂干等方式,补充营养;生长季修剪进行疏枝、拉枝,对枣头、二次枝、枣吊进行“三摘心”;果实脆熟期搭建避雨棚,预防和减少裂果. 相似文献
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为提高冬枣单株产量和质量，生产中采取了木质化枣吊摘心的管理措施。为了更好地推广和应用这一技术措施，笔者进行了木质化枣吊摘心对冬枣坐果率、果实品质影响试验。 相似文献
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为提高冬枣单株产量和质量,生产中采取了木质化枣吊摘心的管理措施.为了更好地推广和应用这一技术措施,笔者进行了木质化枣吊摘心对冬枣坐果率、果实品质影响试验. 相似文献
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以南疆地区密植灰枣为试材,采用生产上常用轻摘心、重摘心、极重摘心等3种枣头枝摘心方法,通过调查、测定枣吊数量、枣吊种类、果实单果质量、可溶性总糖、可滴定酸含量等指标,以确定一种合理的摘心方法。结果表明:枣头枝重摘心的单株坐果数显著高于轻摘心和极重摘心的单株坐果数,平均每株分别高出22.85、19.60个;重摘心后灰枣果实平均单果质量最大,为8.32g,分别比轻摘心和极重摘心灰枣果实的平均单果质量高9.5%、9.4%;枣头枝重摘心果实的可溶性总糖含量最高,为28.74%,分别比轻摘心和极重摘心后果实的可溶性总糖含量高3.86、4.13个百分点。因此,确定幼龄灰枣密植的夏季枣头枝摘心选择重摘心方式。 相似文献
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The effects of combinations of salinity (no salt, 2000 p.p.m. or 4000 p.p.m. of CaCl2 and NaCl, 1:1) and water table (30 cm, 60 cm or 90 cm from the soil surface), on the vegetative growth and tolerance of ‘Golden Japanese’ plum and ‘Mit Ghamre’ and ‘Balady’ peaches were studied. The plants were grown in lysimeters. The growth of the trunk, total shoot length, the increase in shoot length per cm and the fresh weight of top, root and total plant were reduced with increasing salinity of the irrigation water. The effect was accentuated when the plants were maintained at high water table level. The salinity treatments resulted in the death of 43%, 73% and 76% of the plants in the plum, and the ‘Mit Ghamre’ and ‘Balady’ peaches, respectively, indicating that the plum is more tolerant to salinity than the peach. The plants of the salinity treatments showed various symptoms of salt injury, such as leaf burn, defoliation, shoot die-back and finally death. In the peaches, salt injury started to occur in the first growing-season, whereas the salt injury appeared in the plum in the second growing-season. The symptoms were more pronounced in the 4000 p.p.m. treatment than in the 2000 p.p.m. treatment and were more pronounced at the high water table level. The salinity level was the predominant factor and the effect of the water table on the vegetative growth diminished with increase in the salinity level of the irrigation water. 相似文献
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AIM：To establish a fast, accurate and economical technique for culturing mouse pulmonary arteriolar smooth muscle cells (PASMCs), and to explore the effects of hypoxia on the proliferation and apoptosis of the PASMCs. METHODS：In sterile condition, the pulmonary artery was isolated from the male BALB/c mice by digesting with collagenase I, and the cells were cultured in fetal bovine serum-coated flask. Centrifugal procedure was not used during the cell passage. The cell morphology was observed under an inverted phase-contrast microscope. α-Smooth muscle actin was identified by immunocytochemistry and immunofluorescence. The effects of hypoxia on the proliferation and apoptosis of the PASMCs were detected by CCK-8 assay and TUNEL assay. RESULTS：PASMCs were identified by the methods of immunocytochemistry, immunofluorescence staining and observation of morphology. Unlike the rat PASMCs with typical subcultured peak-vally pattern, the mouse PASMCs showed a lot different without a peak-vally pattern. The cells could be subcultured after 5 d to 7 d and there was 3 to 5 generations depending on the activity of the cells. CCK-8 assay demonstrated that the A values of PASMCs exposed to hypoxia increased after 24 h (P＜0.05) as compared with normoxia. TUNEL result showed that the apoptotic index of the PASMCs in hypoxia decreased after 24 h (P<0.05). CONCLUSION：This technique for obtaining cultured mouse PASMCs is simple, fast, accurate and economical. The digestion time is easy to control. Hypoxia promotes the proliferation and inhibits the apoptosis of PASMCs. 相似文献
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小檗碱和壳聚糖抗蔬菜病原真菌活性测定及复合膜制备 总被引：2，自引：0，他引：2
研究了小檗碱和壳聚糖对几种常见蔬菜病原真菌的抑制活性,以及以小檗碱和壳聚糖为主料制备复合膜的方法,并测定了该膜的药物释放效果。试验表明:低浓度(0.234 mg/mL)小檗碱即可抑制辣椒炭疽病菌(Vermicularia capsici)等5种蔬菜病原真菌的生长。20 mg/mL浓度壳聚糖对番茄灰霉病菌(Botrytis cinerea)的抑制率高达65%,而对其余4种果蔬病原真菌也有一定的抑制作用。为了集成这2种天然化合物的优点,制备了小檗碱-壳聚糖复合膜,该膜具有缓释功能,在模拟外部环境(磷酸缓冲液,pH 6.8)条件下,20 d小檗碱累计释放率接近25%,提示其在果蔬贮藏抗菌中的应用价值。 相似文献
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Fresh onion seeds desiccated to 6.0% seed moisture content (SMC) were stored in various packaging materials under different storage conditions. Seeds packed in aluminum-laminated pouches beside those stored with silica gel at 25 °C maintained satisfactory germinability and vigour after 12 months. Desiccated seeds stored in moisture impervious containers produced more vigourous seedlings. Germination potential of onion seeds increased with reduced SMC besides storage in moisture impervious packets along with desiccants as physiological and biochemical attributes are regulated. Seed viability and vigour decreased with accelerated ageing due to increased lipid peroxidation, decreased activities of several free radical and peroxide scavenging enzymes. Electrical conductance of seed leachates also increased with ageing. Thus, adoption of appropriate storage temperature and moisture control techniques would significantly affect onion seed quality, which was due to minimum accumulation of free peroxide radicals and enhanced activity of free radical scavenging enzymes. 相似文献
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以大荔县冬枣种植区采集的发病枣果为试材,采用常规组织分离法进行病原菌的分离纯化,通过柯赫氏证病法则、形态学观察及分子生物学分析,研究鉴定了冬枣黑斑病和炭疽病的病原菌种类,并采用田间调查法对2种病害为害特征进行比较分析,以期为田间有效区分冬枣黑斑病和炭疽病为害症状,并快速判断其病原类型,及进一步深入开展精准防控提供参考和指导.结果表明:陕西大荔冬枣黑斑病的病原菌为细极链格孢(Alternaria tenuissima),炭疽病的病原菌为胶孢炭疽菌(Colletotrichum gloeosporioides).2种病害均主要为害枣果实,在枣果果腰或果肩上形成黑褐色病斑,可能同时存在且症状相近极易混淆,但在病斑表面、皮下及久置表型3个方面存在明显区别. 相似文献
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钾肥在小白菜和萝卜上的施用效果 总被引：6，自引：0，他引：6
采用盆栽试验方法研究了施用钾肥对小白菜、萝卜生长发育、产量、品质及钾素含量的影响。结果表明 ,施用钾肥对小白菜和水萝卜的株高、叶片数无显著的影响 ,但可提高水萝卜块根的产量 ,提高幅度为 31.0 4 %～ 97.93%。施用钾肥可提高小白菜和萝卜的蛋白质和VC含量 ,降低硝酸盐含量 ,增加植株的钾素含量 相似文献