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黄玉洋葱不同的播种期和不同的密度导致洋葱先期抽薹数目和洋葱合格品产量都不相同,笔者通过黄玉洋葱播期和密度二因素试验,结果表明,9月10日播种的洋葱种的洋葱先期抽薹数目少样品合格产量高;行间距为20厘米,株距为15厘米的栽培密度洋葱先期抽薹数目少。建议使用9月10日播种,按照行距为20厘米,株距为15厘米的密度栽培黄玉洋葱。 相似文献
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“中甘11号”早熟甘蓝杂交一代品种是山西夏县早春主栽蔬菜种类之一,历年都获得丰收。1988年早春虽然有部分菜农在大棚保护地栽培取得了平均亩产值2500元以上的高效益,但是其中有部分菜田却意外地发生了先期抽薹现象,个别地块抽薹达90—100%同一品种,甚至同一麻袋的种子,为什么结果会如此不同呢?我们根据调查研究对甘蓝抽薹原因做了分析,认为这次夏县早春甘蓝抽薹的原因主要有以下三方面。 1.特殊气候条件确定适宜的播种期是防止早春甘蓝先期 相似文献
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本试验探讨了甘蓝不同品种、不同播种期对先期抽苔及产量的影响。结果表明:不同品种、不同播期对先期抽苔率的影响达极显著水平;同一品种不同播期的先期抽苔率也达极显著水平。不同品种对产量影响达极显著水平,而不同播期对产量影响不显著。春甘蓝的适宜播期为10月下旬,通过提前播种的方法筛选不易先期抽苔的春甘蓝品种是行之有效的。 相似文献
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冷凉地区种植结球甘蓝容易出现先期抽薹,通过选择耐抽薹品种、调整播种期、加强苗期管理等措施实现结球甘蓝的安全生产,同时,根据不同的海拔和市场定位划分播期可以避免大面积集中供应,规避市场风险。 相似文献
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洋葱具有产量高、品质优、耐贮运等特点,是出口创汇的主要蔬菜品种。但在实际生产中,往往由于秋播过早,肥水管理不当,使苗期营养生长过旺,秧苗在低温季节发棵过大,造成洋葱在鳞茎形成前过早抽薹,导致洋葱产量降低、品质变劣、商品性下降,所以在生产中应采取有效的技术措施避免洋葱先期抽薹的发生。 相似文献
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通过引进国外洋葱品种进行栽培比较试验,筛选适宜洛阳种植的优良品种,总结出配套栽培技术,旨在为建立出口加工洋葱生产基地提供参考。试验选用4个国外优良品种,以2个国内品种为对照,分黄皮和白皮2组进行田间小区试验,结果表明,黄皮洋葱适宜在洛阳地区种植,其中日本红叶3号(黄皮)产量达6817.2kg/667m2,比对照增产12.3%;白皮洋葱抗抽薹力差,产量低。 相似文献
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在3个不同的播期对中日照白皮洋葱品种12C1进行栽培对比试验.试验结果表明,中日照白皮洋葱品种12C1适宜在西昌春播秋收,最适播种期为1月19日,最适收获期为8月14日. 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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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
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大棚葡萄种植过程中,容易产生多种病虫害,如黑痘病、炭疽病等。针对当前山西省大棚葡萄的种植情况,本文分析了大棚葡萄常见的病虫害,重点阐述了病虫害防治技术,如物理防治、化学防治、农业防治、生物防治等,为大棚葡萄病虫害的科学防治提供参考。 相似文献
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云南红河州泸西县为云南重要的苹果新产区,调查鉴定泸西县苹果病虫害的发生情况,对泸西县的苹果病虫害防控,苹果产业发展具有重要意义。本研究系统调查和鉴定了云南红河州泸西县向阳乡习峨村、三塘乡、向阳乡沙马村等3个苹果产区的病虫害。通过室内病原显微观察,对真菌病原进行形态鉴定,应用RT-PCR检测技术与测序鉴定病毒,害虫形态鉴定。最终结果表明:云南泸西苹果病虫害共8种,其中真菌病害3种,有斑点落叶病、枝干轮纹病、褐斑病;病毒病害2种,有苹果茎沟病毒病、苹果花叶病毒病;虫害3种,蚜虫、蓟马和金纹细蛾3种虫害。其中斑点落叶病和褐斑病为主要病害,病毒病害其次,虫害发生率较小。其次通过调查与鉴定,否定了危险性病害苹果炭疽叶枯病在云南泸西的存在。 相似文献
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