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摘要：为解决香葱周年生产引起的连作障碍,经多年研究,形成了香葱—鲜食南瓜—大球盖菇高效栽培模式,其中香葱栽培技术包括品种选择、播种育苗、移栽、肥水管理、病虫害防治、采收等,实现667 m2产量2 000～2 500 kg,667 m2产值10 000～12 500元;鲜食南瓜栽培技术包括品种选择、播种育苗、整地做畦、肥水管理、病虫害防治、采收等,实现鲜食南瓜667 m2产 量4 000～4 500 kg,667 m2产值9 000～10 000元;大球盖菇栽培技术包括基质处理、播种、出菇管理、病虫害防治、采收等,实现667 m2产量1 000～1 500 kg,667 m2产值10 000～12 000元。 相似文献
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种植密度对脱毒怀地黄生长发育、产量和品质的影响 总被引：1，自引：0，他引：1
以怀地黄为试材,研究了怀地黄脱毒试管苗在不同种植密度下(667m~2种植8 000、12 000、16 000、20 000、24 000株)的生长发育、产量和品质的差异,以寻找适合脱毒怀地黄高产优质的种植密度。结果表明:在相同种植密度下,怀地黄脱毒苗在各个生长阶段的株高、叶片数、冠幅和叶片面积变化较大,其中株高、冠幅、叶面积均在9月达到最大值,叶片数在10月达到最大值,667m~2种植密度为20 000株时株高最高,667m~2种植密度为8 000株时冠幅、叶片数和叶片面积最大;667m~2种植密度为20 000株时产量最高,鲜质量为6 105.80kg,干质量为1 393.30kg;梓醇667m~2种植密度为20 000株时达到最大值2.860%,毛蕊花糖苷则在667m~2种植密度为16 000株时达到最大值,为0.085%。综合可知,667m~2种植密度20 000株为脱毒怀地黄种植的最适密度。 相似文献
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‘晋扁1号’扁桃2005年从山西省农科院果树研究所引入,经过多年在甘肃天水试验观察认为,结果早,果仁大,单仁重1.50 g～1.70 g,出仁率35.00%～40.00%,在正常栽培技术管理条件下,4年生树667 m~2平均株产干果1.30 kg,折合667 m~2产量71.50 kg,产值2 800～3 000元,6～7年进入结果盛期667 m~2产量125～150 kg,经济效益5 000～6 000元以上,该品种适宜多种土壤类型栽培,综合经济性状较优良,可作为天水及同类地区大面积推广。 相似文献
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正1栽植密度栽植株行距1.5 m×4 m,2 m×3 m,或2 m×4 m,大规模机械化农场可采用1.5 m×6 m,667 m~2栽77～111株。667 m~2产量控制在4 000～5 000 kg。2树形培养2.1第1年梨树苗(1年生)定植后栽植定干,根据 相似文献
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通过对日光温室茄子秋冬茬栽培现状的调查分析,总结出日光温室茄子无公害栽培技术。提出了育苗、整地施肥、定植及管理、病虫害防治、适时采收等一系列技术措施,实施后取得了显著的经济效益和生态效益,一般标准日光温室大棚667 m~2可产茄子5 000~6 000 kg,收益15 000~20 000元。 相似文献
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《辣椒杂志》2021,19(2)
为研究遵辣9号的较佳种植密度,采取随机区组设计,开展不同种植密度对遵辣9号产量与效益的影响研究。结果表明:随着种植密度的不断加大,遵辣9号产量成曲线变化趋势,峰值出现在2 500株/667 m~2,此时鲜椒产量达1 471.85 kg/667 m~2,比CK 2 000株/667 m~2高5.7%,比处理3 000株/667 m~2高9.5%,比处理3 500株/667 m~2高13.17%,比处理4 000株/667 m~2高34.76%,比处理4 500株/667 m~2高44.98%。2 500株/667 m~2时,经济效益达到最高,为5 298元/667 m~2,减去投入成本后,纯收入最高为2 208元/667 m~2,纯收入产出投入比最高为1∶0.715。结果表明,2 500株/667 m~2是遵辣9号较佳的群体结构和种植密度。 相似文献
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大棚菱角-甲鱼种养结合技术 总被引：1，自引：0，他引：1
《上海蔬菜》2019,(6)
菱角口感清香,营养丰富,风味独特;甲鱼肉质鲜美,是深受消费者喜爱的名贵水产品之一。作者经过多年的生产实践,总结出了大棚菱角—甲鱼种养模式,经济效益可观。667 m~2可采收菱角2 800 kg左右,经济效益约20 000元;667 m~2可收甲鱼50 kg左右,经济效益10 000元以上;667 m~2总产值约30 000元、纯效益15 000元以上。 相似文献
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白沙迟花晚萝卜的选育 总被引：1，自引：0，他引：1
白沙迟花晚萝卜是从萝卜杂交一代92110A中的变异株经系统选育而成的新品种,表现高产、优质、耐抽薹,抗霜霉病和病毒病等特点,冬春季播后65天可收获,菜用持续期30天以上,每667 m2产量4 000～5 000kg. 相似文献
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AIM: Although endovascular radiotherapy inhibits neointimal hyperplasia, the exact alterations induced by β-particles irradiation remain to be elucidated. The objective of this study was to investigate the ability and the cellular mechanism of local β-particles emission from 188Re to inhibit vascular smooth muscle cells (SMCs). METHODS: The SMCs in vitro were irradiated by 188Re with single doses of 2.6 Gy-25.8 Gy. The effects of β-particles on SMCs, such as effective irradiate doses, the period of inhibition for SMCs proliferation, the changes of cell proliferation rate and DNA synthesis rate, cell cycle progression and related gene expression, were investigated by cell count, [3H]-TdR incorporation, cell cycle progression analysis, cell viability and immunocytochemistry, respectivecy. RESULTS: β-particles irradiation with dose of 5.2 Gy could inhibit significantly SMCs proliferation. At dose of 20.6 Gy DNA synthesis inhibitory rate was 92%, SMCs proliferation rate was only 3%. Renoval of 188Re did not abolish the inhibitory effects of β-particles on SMCs proliferation. The expression of P53 was up regulation and PCNA was down regulation after irradiation. CONCLUSION: β-particles from 188 Re was significantly effective and permanent in inhibiting SMCs proliferation, and inhibitory effect was in dose-dependet manner ED50was 5 Gy, the best dose to inhibit SMCs proliferation was 20 Gy. β-particles irradiation induced SMCs to occur G0/G1 arrest, damaged the ability of SMCs reproliferation and led to cell clonogenic death. P53 and PCNA had regulatiory effects on SMCs proliferation after β-particles irradiation. 相似文献
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AIM:To study the effect of L-Arg on plasma content of endothelin (ET) and the expression of proto-oncogene c-fos mRNA in the left ventricle of rats with renovascular hypertensive hypertrophy. METHODS: The level of c-fos mRNA were measured by in situ hybridization. The ET in plasma were measured by radioimmunoassay. RESULTS:After eight weeks of treatment with L-Arg, the expression of c-fos decreased markedly (P＜0.01). The ET content in plasma also decreased significantly by L-Arg(P＜0.01).CONCLUSION: Plasma ET content and the expression of c-fos in the left ventricle of rats with renovascular hypertensive hypertrophy could be decreased by L-Arg administration. 相似文献
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《International Journal of Fruit Science》2013,13(3):101-120
Abstract Saskatoon berry (Amelanchier alnifolia Nutt., Rosaceae) and blueberry (Vaccinium corymbosum L., Ericaceae) are substantially equivalent in all characteristics that are important to the consumer, including fruit color, shape, size, nutrition, texture, and uses. In addition, both fruits are native to North America and they have practically identical historical uses and known health benefits. Their composition, processing, nutritional value and metabolism, intended uses, and levels of undesirable substances are compared. 相似文献
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多效唑对猕猴桃离体试管苗生长及内源激素的影响 总被引：18，自引：0，他引：18
多效唑（ＰＰ３３３）处理猕猴桃试管苗，降低了其生长强度；植株体内的ＧＡ３、ＩＡＡ和ＺＴ含量下降，ＡＢＡ的含量上升，乙烯释放率增加；并且能降低外源的ＧＡ３和ＩＡＡ促进生长的作用，而外源的ＧＡ３和ＩＡＡ又能不同程度地逆转多效唑的抑制作用，使植株恢复生长。 相似文献
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HU Zhi-cheng ZHU Jia-yuan ZHU Bin GUO Dong CHEN Bin ZHANG Kai HU Kun-hua LI Ming-tao TANG Bing 《园艺学报》2011,27(9):1802-1806
AIM: To investigate and screen the sensitive proteins in the formation mechanism of pathological scars by comparing the results of differential proteomic analysis between pathological scars and normal skin.METHODS: Two-dimensional gel electrophoresis was used to detect the protein expression profiles in 8 keloid patients, 8 hypertrophic scar patients and 3 matched normal skin patients.The proteins that showed differential expression of over 4-fold change were cut and analyzed by MALDI-TOF/TOF mass spectrometry.RESULTS: A two-dimensional protein profiling comparison between pathological scars and normal skin was successfully established.On average, 2 978 spots in keloid, 2 975 spots in hypertrophic scar and 3 053 spots in normal skin were identified using gel analysis software.Compared with normal skin, there were totally 36 differentially-expressed proteins in keloid and hypertrophic scar identified from the spots of over 4-fold change, including 16 proteins in both keloid and hypertrophic scar (8 up-regulated and 8 down-regulated), 11 only in keloid (9 up-regulated and 2 down-regulated) and 9 only in hypertrophic scar (4 up-regulated and 5 down-regulated).CONCLUSION: Proteomic analysis can identify the proteins with variance of pathological scars versus normal skin, thus providing probable new clues to reveal the formation mechanism of pathological scars. 相似文献
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The objective of this study was to establish a cryopreservation protocol for hawthorn shoot apices (Crataegus pinnatifida Bge.). Cryopreservation was carried out via encapsulation–dehydration, vitrification, and encapsulation–vitrification on shoot apices excised from in vitro cultures. We began by showing that cold-acclimation enhanced the regrowth of cryopreserved apices from 10.0 to 65.5% in encapsulation–dehydration. We then decided that the encapsulation–dehydration method was an optimal cryopreservation method for hawthorn shoot apices in terms of its high recovery after cryopreservation as well as its ease of use compared with vitrification and encapsulation–vitrification. In encapsulation–dehydration, the protocol leading to optimal regrowth was as follows: after cold-acclimation at 5 °C in the dark for 2 weeks, excised shoot tips were pretreated for 24 h at 25 °C on hormone-free Murashige and Skoog [Murashige, T., Skoog, F., 1962. A revised medium for rapid growth and bioassays with tobacco tissue culture. Physiol. Plant. 15, 473–497] (MS) basal medium with 0.4 mol/L sucrose, then encapsulated and precultured in liquid MS medium with 0.8 mol/L sucrose for 16 h at 25 °C. Precultured beads were dehydrated for 6 h at 25 °C in the dessicator containing 50 g silica gel to a moisture content of 15.3% (fresh-weight basis) before cryostorage for 1 h. In addition, we examined the effect of adding glycerol to both the alginate beads and loading solution to enhance regrowth after cryopreservation in encapsulation–dehydration. In the present study, it was shown that adding 0.5 mol/L glycerol resulted in high regrowth percentages (82.5–90.0%) in four Crataegus species. 相似文献
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Duncan Brean W. Boyle Shannon Breininger David R. Schmalzer Paul A. 《Landscape Ecology》1999,14(3):291-309
Historic landcover dynamics in a scrubby flatwoods (Tel-4) and scrub landscape (Happy Creek) on John F. Kennedy Space Center were measured using aerial images from 1943, 1951, 1958, 1969, 1979, and 1989. Landcover categories were mapped, digitized, geometrically registered, and overlaid in ARC/INFO. Both study sites have been influenced by various land use histories, including periods of range management, fire suppression, and fire management. Several analyses were performed to help understand the effects of past land management on the amount and spatial distribution of landcover within the study sites. A chi-squared analysis showed a significant difference between the frequency of landcover occurrence and management period. Markov chain models were used to project observed changes over a 100-year period; these showed current management practices being effective at Tel-4 (restoring historic landscape structure) and much less effective at Happy Creek. Documenting impacts of past management regimes on landcover has provided important insight into current landscape composition and will provide the basis for improving land management on Kennedy Space Center and elsewhere. 相似文献
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AIM:To investigate the effect of metallothionein(MT) on proliferation of rat vascular smooth muscle cells (VSMCs) stimulated by homocysteine and its mechanism. METHODS:VSMCs proliferation was measured by [3-H]-TdR incorporation, mitogen-activated protein kinase(MAPK)activity were determined by immunoprecipitation method, the intracellular contents of MT and malondialdehyde (MDA)were assayed by -hemoglobin saturation method and TBA reaction, respectively, and lactate dehydrogenase (LDH) leakage was measured by NADH oxidation. RESULTS:Hcy(10-6-10-4 mmol/L) stimulated [3-H]-TdR incorporation by the VSMCs in a concentration-dependent manner. Compared with control, [3-H]-TdR incorporation in VSMCs treated with 0.1 mmol/L Hcy was increased by 4.2 fold (P＜0.01). Meanwhile, Hcy enhanced MAPK activity, MDA formation and LDH release (P＜0.01)in a concentration-dependent manner. Treatment of VSMCs with MT alone did not change above parameters, compared with control. However, MT (10-6-10-4 mol/L)attenuated significantly Hcy-stimulated proliferation of VSMCs (P＜0.01)in a concentration-dependent manner. And MT inhibited obviously Hcy-induced activation of MAPK activity, MDA formation and LDH release. Preincubation of VSMCs with 0.5 mmol/L ZnCl2 for 6 h induced an increase cellular MT content by 5.7-fold (P＜0.01). The MT-overexpressed VSMCs resisted Hcy-stimulating action on MAPK activity, MDA formation and LDH leakage (P＜0.01). CONCLUSION:These results show that MT has an inhibitory effect on Hcy-induced VSMCs proliferation, and that MT could inhibit Hcy-stimulated MAPK activity and lipid peroxidation. 相似文献
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AIM: Previous studies performed with XBP-01 in vitro indicated that XBP-01 could inhibit vascular smooth muscle cells from being transformed into foam cell and could eliminate the atherosclerotic plaque in C57BL/6J mouse. This experiment is to investigate its mechanism of eliminating plaques in vitro. METHODS: The cultured porcine artery smooth muscle cells incubated with XBP-01 of 0.1 mg/L for 24 h after preincubated with oxidized low density lipoprotein of 15 mg/L for 72 h in vitro. The samples were analyzed by fluorescence microscope, confocal microscope system and flow cytometry. RESULTS: Apoptosis was triggered by being incubated with oxidized low density lipoprotein and this process was accelerated additionally by being incubated with XBP-01. CONCLUSION: XBP-01 can be effective in eliminating atherosclerotic plaque by accelerating the process in which oxidized low density lipoprotein induced smooth muscle cell apoptosis. 相似文献
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Species distribution models (SDMs) often use elevation as a surrogate for temperature or utilise elevation sensitive interpolations
from weather stations. These methods may be unsuitable at the landscape scale, especially where there are sparse weather stations,
dramatic variations in exposure or low elevational ranges. The goal of this study was to determine whether radiation, moisture
or a novel estimate of exposure could improve temperature estimates and SDMs for vegetation on the Illawarra Escarpment, near
Sydney, Australia. Forty temperature sensors were placed on the soil surface of an approximately 12,000 ha study site between
November 2004 and August 2006. Linear regression was used to determine the relationship with environmental factors. Elevation
was correlated more with moderate temperatures (winter maximums, summer minimums, spring and autumn averages) than extreme
temperatures (summer maximums, winter minimums). The correlation (r
2) between temperature and environmental factors was improved by up to 0.38 by incorporating exposure, moisture and radiation
in the regressions. Summer maximums and winter minimums were predominately determined by exposure to the NW and coastal influences
respectively, while exposure to the NE and SW was important during other seasons. These directions correspond with the winds
that are most influential in the study area. The improved temperature estimates were used in Generalised Additive Models for
37 plant species. The deviance explained by most models was increased relative to elevation, especially for moist rainforest
species. It was concluded that improving the accuracy of seasonal temperature estimates could improve our ability to explain
the patchy distribution of many species.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献