共查询到20条相似文献,搜索用时 50 毫秒
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在高温、多雨、病虫害发生严重的炎夏时节,性喜冷凉的菠菜生长困难,因此7~9月市场上菠菜紧缺,价格居高。近几年笔者对如何利用夏季休闲期大棚种好夏菠菜进行了专门研究,两茬夏菠菜每667m2产量1800kg左右,7~8月菠菜市场价格约为每千克5元,经济收入9000元左右。下面将其技术要点进行简要概括,供农民朋友参考。1设施要求大棚必须覆盖完整的塑料薄膜,以防雨水渗漏棚内。顶部薄膜应固定牢固,棚底角薄膜全部掀起,以利通风降温。在薄膜上再盖上遮光率80%以上的黑色遮阳网,长度要比棚体长2m左右,面积要占薄膜面积的70%以上。覆盖薄膜和遮阳网可以… 相似文献
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近几年,山东省鄄城县秋菠菜生产发展迅速,面积达1 500 hm2,产量高达0.67亿kg。鄄城县地处鲁西平原,土壤肥沃,是全国农业生态示范县,所产菠菜新鲜嫩绿,安全、卫生、优质、无污染,属于无公害产品。秋菠菜经速冻加工后大量出口日本、韩国,成为主要出口蔬菜种类之一。1 品种选择出口菠菜特别要求漂烫后不变黑,色泽翠绿。目前表现优良的品种是香港多利牌全能菠菜,该品种适应性广,生长快,高产,具有株型直立、叶片肥厚、色泽浓绿等特点,非常受日本客商欢迎。另外,可选用的优良品种还有东湖、急先锋等。2 选地施肥宜选用有机质丰… 相似文献
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毛豆(Glycinemax Merr.)为一年生草本蔬菜,含有丰富的碳水化合物、脂肪、蛋白质、粗纤维、维生素和铁、磷、钙等矿物质,营养全面,味道鲜美,越来越受消费者的欢迎。笔者现将夏毛豆栽培技术简介如下。1选择优良品种目前生产上用的毛豆品种基本上都是春用品种,夏季栽培表现耐热性差,生长势弱,产量降低。因地制宜选用优良品种,如低洼地应选择耐涝性强的品种,土质肥沃的地块应选择喜肥、耐肥品种。总的原则是选择丰产、优质、抗病虫、抗逆性强的品种,但更重要的是选择适销对路、适宜本地种植的品种。2整地作畦种夏毛豆应选择排灌方便、土质疏松… 相似文献
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日本大叶菠菜适应种植的范围比较广,引进我国种植后,它的长势仍然很强。植株半直立,叶簇生,叶片长椭圆形,颜色嫩绿,叶片肥厚,味美,品质佳,适合于速冻出口。目前国际市场一直货紧价昂,特别是在日本市场,大叶菠菜一直供不应求。在国内市场也深受广大消费者的欢迎。种植日本大叶菠菜具有生长期短、费工少、产量高、效益好等特点。其栽培技术要点如下:一、适期播种在江苏南通地区适宜的播种期为9月中旬~10月上旬,一般在播后80天左右开始采收。二、基地选择对土地要求比较高,要选择肥沃疏松、排水良好的沙质土壤。前茬以玉米、黄… 相似文献
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Spiders associated with the meadow and tree canopies of orchards respond differently to habitat fragmentation 总被引:1,自引:0,他引:1
John D. Herrmann Debra Bailey Gabriela Hofer Felix Herzog Martin H. Schmidt-Entling 《Landscape Ecology》2010,25(9):1375-1384
The response of animal communities to habitat quality and fragmentation may vary depending on microhabitat associations of
species. For example, sensitivity of species to woody habitat fragmentation should increase with their degree of association
with woody plants. We investigated effects of local and landscape factors on spider communities in different microhabitats
within Swiss apple orchards. We expected a stronger negative effect of woody habitat fragmentation on spiders inhabiting tree
canopies compared to spiders living in the meadow. The 30 orchards that we sampled varied in woody habitat amount and isolation
at landscape and patch scales. Local factors included management intensity and plant diversity. Spiders associated with meadow
were affected by plant diversity, but not by fragmentation. In contrast, spiders associated with canopies responded to isolation
from other woody habitats. Surprisingly, we found both positive and negative effects of habitat isolation on local abundance.
This indicates that differences in dispersal and/or biotic interactions shape the specific response to habitat isolation.
The relative importance of local and landscape factors was in accordance with the microhabitat of the spiders. Thus, considering
microhabitat associations can be important for identifying processes that would be overlooked if sampling were pooled for
the whole habitat. 相似文献
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在银杏嫩枝扦插育苗中进行了ABT生根粉应用试验。结果表明,除了用ABT8号20mg/kg浓度处理的扦插成活率低于对照外,其余各处理均明显高于对照,其中6号生根粉100mg/kg处理的扦插成活率高达91.3%,比对照提高52.5个百分点。ABT生根粉6号的20、50和100mg/kg的处理扦插成活率为61.3%~91.3%,平均为76.3%,高于7号和8号,且效果稳定,可在生产中试用。试验结果还表明,带顶芽的、粗壮的插条扦插成活率高。ABT生根粉处理可增加扦插苗生根数量,最长根长度与对照差异不大。 相似文献
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当前梨树生产中存在“老、低、差”问题,即品种老、档次低、品质差,不能适应市场需要。梨的品种结构也不合理,早熟梨少,市场紧俏;中晚熟品种太多,成熟季节造成滞销。因此需要调整品种结构,运用高接换种的方法改造劣质梨园。夏季高接换种的优点在于容易区别品种。因不同品种的形态各异,如叶片形状和大小、枝条长势、树姿特征、果实形状等。已结果树还可以品评品质好坏。对确定为劣质品种的树株即可进行高接换种。生长季节嫁接易成活,一般比冬季嫁接成活率高,可操作时间长,从新梢成熟到停止生长前均可嫁接,便于当年补接,一般6月… 相似文献
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本试验以国内普遍应用的美国泛美公司矮牵牛品种为材料,通过对比美国维生基质与国产草炭的栽培效果,阶段性记录矮牵牛穴盘苗的生长状况。结果表明,维生模式下的矮牵牛生物量累积、干物质累积与根冠比变化都显著优于国产模式,可以作为优质穴盘苗的标准。 相似文献
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J. R. Fellows D. C. E. Wurr K. Phelps R. J. Reader 《The Journal of Horticultural Science and Biotechnology》2013,88(3):328-336
SummaryTwo experiments were conducted with the early summer cauliflower cvs Perfection and Gypsy. The first was in controlled environment cabinets with nine temperatures ranging from 6.3 to 22.88C. The second was in the field with three planting dates and plants grown with and without fleece cover. The experiment in controlled environments enabled a model to be developed which predicted changes in apex development through both the juvenile and curd induction phases. Both the end of juvenility and curd initiation were defined in terms of apex diameter. For cv. Perfection these were respectively 0.25 and 0.55.mm while with cv. Gypsy they were respectively 0.27 and 0.51.mm. The number of leaves produced at the end of juvenility was very different in the two experiments. When applied to the field temperatures from planting, the model predicted the end of juvenility early and therefore estimates of curd initiation were inaccurate. However, when the model was started, with the recorded apex diameter exceeding that at the end of juvenility, it predicted the day of curd initiation well. The temperatures representing the lower limit, optimum and upper limit of curd induction, were estimated to be 2.2, 9.4 and 248C for cv. Perfection and 2.9, 13.0 and 23.18C for cv. Gypsy. The results suggest that juvenility is not adequately described by number of leaves and varies considerably with growing conditions. They indicate that, under optimum conditions, curd induction only takes about six days and that the critical difference between crops is the duration of juvenility. 相似文献
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Penta Pristijono Christopher J. Scarlett Michael C. Bowyer Quan V. Vuong Costas E. Stathopoulos Andrew J. Jessup 《The Journal of Horticultural Science and Biotechnology》2017,92(6):583-590
Freshly harvested vine-ripened tomatoes (Solanum lycopersicum cv. Neang Pich) were stored at low pressure (4 kPa) at 10°C for 11 days with 100% RH. Fruit quality was examined upon removal and after being transferred to normal atmosphere (101 kPa) at 20°C for 3 days. Weight loss was significantly lower in fruits which were stored at low pressure (4 kPa) than in fruits that were stored at regular atmosphere (101 kPa) at 10°C. Fruits that were stored at low pressure (4 kPa) reduced calyx browning by 12.5%, and calyx rots by 16%, compared to fruits that were stored at regular atmosphere (101 kPa) at 10°C. Fruit firmness was not significantly different between fruits stored at low pressures (4 kPa) and the normal atmosphere (101 kPa), with an average firmness of 14 N after fruits were stored at 10°C for 11 days. There was no difference in the SSC/TA ratio. The results suggest that a low pressure of 4 kPa at 10°C has potential as an alternative, non-chemical postharvest treatment to improve tomato quality during storage. 相似文献