生菜品种比较试验   总被引：1，自引：1，他引：1  

吉立柱  贾占温 《天津农业科学》2006,12(4):47-49

2005年对6个生菜品种(品系)分别在春保护地和秋露地进行了品种比较试验。试验结果表明,04SP03和04SP07综合表现最为突出,均表现极耐先期抽薹,04SP03表现中早熟,产量最高,口感微甜,品质好,叶质脆,叶色鲜绿,叶片数多;04SP07极早熟,产量在极早熟品种中最高,口感清淡,叶质脆,叶色鲜绿。04SP03和04SP07可分别作为中早熟和极早熟生菜新品种在天津地区推广种植。  相似文献   

不同铁源对水培生菜产量、品质影响的研究     

杨生华  洪坚平  孟会生  廉圆圆 《山西农业科学》2007,(10)

通过水培生菜,采用完全随机设计,研究了我省境内水质条件下,应用不同的铁源对生菜生长的影响,对五种铁源进行了对比研究,试验结果表明:腐殖酸铁(FA-Fe)比EDTA-Fe价格低廉,效果优于FeC6H5O7、FeSO4与FeCl3,是一种效果较好值得推广的铁源。以腐殖酸铁(FA-Fe)为铁源可以提高叶片叶绿素含量,过氧化氢酶活性以及根系活力;提高生菜中Vc,还原糖的含量,降低硝态氮含量,明显提高生菜的产量。  相似文献   

Effect of Application of Chromium Feedstock Compost on the Growth and Bioavailability of Some Trace Elements in Lettuce     

《Communications in Soil Science and Plant Analysis》2012,43(15-16):2426-2439

A pot experiment was conducted to investigate the effect of chromium compost (0, 10, 30, and 50%) on the growth and the concentrations of some trace elements in lettuce (Lactuca sativa L.) and in the amended soils. Compost addition to the soil (up to 30%) increased dry matter yield (DMY); more than 30% decreased DMY slightly. The application of compost increased soil pH; nitric acid (HNO₃)–extractable copper (Cu), chromium (Cr), lead (Pb), and zinc (Zn); and diethylenetriaminepentaacetic acid (DTPA)–, Mehlich 3 (M3)–, and ammonium acetate (AAc)–extractable soil Cr and Zn. The addition of Cr compost to the soil increased tissue Cr and Zn but did not alter tissue cadmium (Cd), Cu, iron (Fe), manganese (Mn), nickel (Ni), and Pb. The Cr content in the lettuce tissue reached 5.6 mg kg^?1 in the 50% compost (326 mg kg^?1) treatment, which is less than the toxic level in plants. Our results imply that compost with high Cr could be used safely as a soil conditioner to agricultural crops.  相似文献   

施肥量对醋糟基质栽培生菜的影响     

高蓓  李萍萍  赵青松  王纪章  郑洪倩 《中国土壤与肥料》2012,(1):95-98

研究了5种施肥量处理[正常施肥量的0 (0 s)、1/8 (1/8 s)、1/4 (1/4 s)、1/2( 1/2 s)和1(1 s)单位]对醋糟混合基质栽培生菜生长以及品质的影响.结果表明,1/4单位施肥量(1/4 s)处理下醋糟基质的pH和EC值变化较其他处理平稳.1/4单位施肥量(1/4 s)处理下生菜茎粗、产量、根鲜重、叶鲜重最大,而1个单位施肥量(1 s)处理下上述指标最小.对采收时生菜品质的分析表明,生菜叶片内的硝酸盐含量随着施肥量的增加而迅速上升,1个单位施肥量(1 s)处理下生菜叶片中硝酸盐和可溶性蛋白含量最高,1/4单位施肥量(1/4s)处理下生菜叶片中可溶性糖含量最高.综合考虑产量和品质,采用1/4单位的配方(1/4 s)是适合醋糟基质栽培生菜的施肥配方.  相似文献   

不同有机基质对生菜产量和品质的影响   总被引：5，自引：0，他引：5  

宋晓晓  邹志荣  曹凯 《西北农林科技大学学报(自然科学版)》2013,41(6):153-160

【目的】研究不同有机基质对生菜产量和品质的影响,为探索有机生菜的栽培技术提供参考。【方法】将香菇菇渣、玉米秸秆、羊粪、珍珠岩按不同体积比混合配制成12种有机栽培基质,以V(沙土)∶V(羊粪)=10∶2为CK1、台湾美庭基质为CK2,采用随机区组设计,对散叶生菜进行有机生态型无土栽培试验,探讨不同基质配方的理化性质及其对生菜产量和品质的影响,并采用隶属函数评价各基质配方的优劣。【结果】12种有机栽培基质对生菜均有增产效应,较CK1的增幅为226.51%～746.86%,较CK2的增幅为6.19%～31.58%;有机栽培基质能有效提高生菜的VC和还原糖含量,其中VC含量较CK1的增幅为0.34%～208.26%,较CK2的增幅为2.28%～202.79%,还原糖含量较CK1的增幅为7.55%～156.64%,较CK2的增幅为5.78%～86.68%;12种有机栽培基质能显著降低生菜的硝酸盐含量,较CK1的降幅为28.28%～84.35%,较CK2的降幅为10.10%～78.00%。【结论】综合产量及品质指标,得出V(菇渣)∶V(玉米秸秆)∶V(羊粪)∶V(珍珠岩)=3∶4∶1∶4、V(菇渣)∶V(玉米秸秆)∶V(羊粪)∶V(珍珠岩)=2∶4∶2∶4、V(菇渣)∶V(玉米秸秆)∶V(羊粪)∶V(珍珠岩)=4∶3∶1∶4和V(菇渣)∶V(玉米秸秆)∶V(珍珠岩)=4∶4∶4为较理想的有机栽培基质配方。  相似文献   

Effects of Organic and Chemical Fertilizers and Arbuscular Mycorrhizal Inoculation on Growth and Quality of Cucumber and Lettuce     

《Journal of Crop Improvement》2013,27(1):313-324

Summary

Arbuscular mycorrhizae were inoculated into phosphorus-deficient soil fertilized with either organic or chemical fertilizer with cucumber (Cucumis sativus L.) as the first crop and lettuce (Lactu-ca sativa L.) as the second crop but without additional fertilization and AM inoculation. AM increased dry matter and fruit yield of cucumber significantly in the unfertilized, organic-fertilized and P-deficient plants compared with the fully chemical-fertilized plants. AM inoculation increased the available phosphorus in plant and soil by around 30% for all treatments except for those chemically-fertilized. The rate of AM infection did not differ significantly among the fertilization treatments, but the infection intensity was higher in unfertilized, organic-fertilized and phosphorus-deficient treatments than chemical-fertilized treatment. The residual effects of AM-inoculated to cucumber were evident for lettuce in all pre-treatments that were unfertilized and un-inoculated for the second cropping. Without P-fertilization, neither crop could grow optimally even when the soil was inoculated with AM, suggesting that AM could not serve as a substitute for phosphorus fertilizer. However, the other beneficial effects of AM on crop growth and yield could not be fulfilled with phosphorus fertilizer.  相似文献   

结球生菜品种比较试验     

金钟  黄谊  戴光明  王利红 《安徽农业科学》2001,29(5):640-641

对征集的结球生菜品种进行品比试验 ,从中发现 4个表现突出的良种 ,建议今后进一步筛选 ,并在大田生产中大面积推广  相似文献   

Shiga toxin 2eB‐transgenic lettuce vaccine is effective in protecting weaned piglets from edema disease caused by Shiga toxin‐producing Escherichia coli infection     

Takashi Hamabata  Toshio Sato  Eiji Takita  Takeshi Matsui  Taishi Imaoka  Nobuo Nakanishi  Keizo Nakayama  Takamitsu Tsukahara  Kazutoshi Sawada 《Animal Science Journal》2019,90(11):1460-1467

Porcine edema disease (ED) is a toxemia that is caused by enteric infection with Shiga toxin 2e (Stx2e)‐producing Escherichia coli (STEC) and is associated with high mortality. Since ED occurs most frequently during the weaning period, preweaning vaccination of newborn piglets is required. We developed stx2eB‐transgenic lettuce as an oral vaccine candidate against ED and examined its protective efficacy using a piglet STEC infection model. Two serially developed Stx2eB‐lettuce strains, 2BN containing ingredient Stx2eB constituting a concentration level of 0.53 mg Stx2eB/g of powdered lettuce dry weight (DW) and 2BH containing ingredient Stx2eB constituting a concentration level of 2.3 mg of Stx2eB/g of powdered lettuce DW, were evaluated in three sequential experiments. Taken the results together, oral administration of Stx2eB‐lettuce vaccine was suggested to relieve the pathogenic symptoms of ED in piglets challenged with virulent STEC strain. Our data suggested that Stx2eB‐lettuce is a promising first oral vaccine candidate against ED.  相似文献   

Acquisition and ecological characterization of <Emphasis Type="Italic">Lactuca serriola</Emphasis> L. germplasm collected in the Czech Republic,Germany, the Netherlands and United Kingdom     

A. Lebeda  I. Doležalová  E. Křístková  K. J. Dehmer  D. Astley  C. C. M. van de Wiel  R. van Treuren 《Genetic Resources and Crop Evolution》2007,54(3):555-562

Expeditions were conducted in the Czech Republic, Germany, the Netherlands and United Kingdom in 2001 (partly 1998) to study Lactuca serriola L. (prickly lettuce, compass plant) geographic distribution, ecology, habitat characteristics and occurrence of diseases and pests on this species. During these missions the seed material of L. serriola L. was collected in an east–west transect of these four countries. The European transect where seeds were collected and field observations were made represents a relatively large area between 2°34′50′′ W–17°32′46′′ E and 47°40′42′′–54°04′19′′ N. The seed material was used for regeneration, inclusion in the national genetic resources collections of individual countries and for research purposes in follow-up studies. During the missions, 50 locations with occurrence of L. serriola L. were visited (16 in Czech Republic and Germany, 10 in UK and 8 in the Netherlands). Individual seed lots of sixteen different plants were collected at each location (L. serriola L. population). Thus, in total 800 seed samples were collected. In Czech Republic and Germany L. serriola L. f. serriola dominated in all observed populations, in the Netherlands both f. serriola and f. integrifolia occurred in pure or mixed stands, whereas in the United Kingdom L. serriola L. f. integrifolia (S.F. Gray) S.D. Prince et R.N. Carter was dominant. L. serriola L. was recorded at various altitudes (−4 to 410 m), different habitats (ditches, along roads, fields and field margins, ruderal places, pavements and parking sites, fallow fields), individual populations varied substantially in size (20 to >1000 plants), area covered (25–10,000 m²), and the structure and character of associated plant communities. Natural infections by downy mildew (Bremia lactucae Regel) and powdery mildew (Golovinomyces cichoracearum (DC.) V.P. Gelyuta) were observed in some populations. B. lactucae Regel was recorded only in Czech Republic, G. cichoracearum (DC.) V.P. Gelyuta was more common in continental Europe. General and specific aspects of L. serriola L. geographic distribution and ecology are discussed.  相似文献   

Root growth and nitrogen uptake of carrot, early cabbage, onion and lettuce following a range of green manures   总被引：2，自引：0，他引：2  

K. Thorup-Kristensen 《Soil Use and Management》2006,22(1):29-38

An experiment was performed to study the significance of rooting depth of four vegetable crops on their utilization of green manure nitrogen (N). Rates of rooting depth development were estimated as approximately 0.2, 0.7, 1.2 and 1.2 mm day °C^?1 for onion, carrot, lettuce and cabbage, respectively. At harvest, onion and lettuce were found to be shallow‐rooted with final rooting depths of only 0.3 and 0.6 m, respectively, whereas carrot and cabbage reached rooting depths of at least 1.1 m. The two deep‐rooted vegetables increased their N uptake by 46, 24 and 7 kg N ha^?1 when following winter‐hardy legumes, non‐hardy legumes and rye, respectively; the equivalent responses by the two shallow‐rooted crops were 23, 9 and 15 kg N ha^?1, respectively. Thus the deep‐rooted crops used the legume N more efficiently but the shallow‐rooted crops made better use of N left by the non‐legume rye crop. These interactions between green manure type and vegetable crop N response are the result of the dual effects of the green manures: biological N fixation by the legumes, and the variable ability of the green manure crops to concentrate available N in the topsoil. Before shallow‐rooted crops, the ability of rye to concentrate N in the topsoil may be as important as the N fixing ability of legumes.  相似文献