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京郊旱区农业主要玉米品种的最适播期和密度研究 总被引:1,自引:0,他引:1
以近年来北京市更新换代的京科968等6个品种为试验材料,研究适宜这些品种的最佳播期和密度。结果发现春播品种京科968密度控制在4000株/667m2较适宜,在5月10日播种,子粒千粒重和穗粒重最高,产量水平最高;春播品种联科96密度控制在4000株/667m~2,在4月30日播种,产量水平最高;春播品种农华101密度控制在4000株/667m~2,在4月20日和5月10日播种,产量水平较高。夏播品种京农科728在高密度条件下产量水平较高,尤其是6000株/667m~2密度下,产量最高,达到699.9kg/667m~2,同时田间倒伏倒折率保持较低水平,是一个耐密型品种,夏播品种旺禾8号不适宜高密度种植,可以针对特殊区域进行种植。京单68产量水平较高,较耐密植,高抗倒伏,可以在一些区域作为替代品种进行种植推广。 相似文献
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为探索在马铃薯起垄覆膜打孔栽培技术条件下,适宜的地膜种类与种植密度,试验设置白色地膜、黑色地膜与反光地膜三种地膜处理与4000株/667m~2、5000株/667m~2、6000株/667m~23个不同密度处理的双因子试验,研究不同种类地膜与不同密度对早熟马铃薯费乌瑞它的产量及性状的影响。试验结果表明:早熟马铃薯品种费乌瑞它不同密度间产量差异显著,在4000~6000株/667m~2均随密度增加而增加;不同种类地膜覆盖存在差异,其中白色地膜与反光膜差异显著;地膜与密度间交互作用不显著;采用反光膜覆盖,密度6000株/667m~2处理产量最高达2087.3kg/667m~2。 相似文献
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研究采用二因素随机区组实验设计方法,以酒用高粱"茅梁1号"为试验材料,进行田间栽培试验,来探索种植密度和施肥量对其产量及其相关性状的影响。结果表明,不同处理条件下的高粱单株产量和单产分别在29.67~46.67 g、261.80~519.70 kg/667m~2。种植密度对单株产量、群体产量和穗长都具有重要影响,单株产量随着密度的增大而减小,群体产量却显著提高;当种植密度为10000株/667m~2时与对照处理相比的增产效果最为明显,在57.20%~68.17%之间,当种植密度10000株/667 m~2、施肥量30kg/667 m~2时单产最高,但是对千粒重影响不显著。施肥对高粱单株产量、群体产量、穗长和千粒重的影响均不显著。 相似文献
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本研究设置4000株/667m~2、4500株/667m~2、5000株/667m~2和5500株/667m~2 4个密度处理,分析了种植密度对玉米新品种泛玉298产量和产量构成因素的影响。结果表明:泛玉298叶面积指数、秃尖长和子粒含水量均随种植密度的增加呈增加的趋势;随着种植密度的增加,其株高、穗长、穗粗、行粒数和千粒重降低;5000株/667m~2密度处理下,泛玉298产量明显高于其他处理。因此,为发挥泛玉298高产潜力,最佳种植密度为5000株/667m~2。 相似文献
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介绍了运用冷冻干燥技术进行速溶蛋花汤的加工,研究了生产工艺、特点以及影响产品质量的主要因素。试验表明,采用冷冻干燥技术加工的速溶蛋花汤,具有营养丰富、风味独特、方便快捷等特点。 相似文献
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南瓜降糖功能及其系列食品加工技术 总被引:3,自引:0,他引:3
阐述了南瓜在糖尿病辅助治疗方面的功能特性,介绍了南瓜降糖主要制品南瓜全粉、南瓜脆片、南瓜果酱和南瓜肉汁的工艺流程和操作要点。 相似文献
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母猪繁殖障碍成因分析 总被引:3,自引:0,他引:3
繁殖障碍是导致母猪淘汰的最主要因素,直接造成母猪非生产天数延长,繁殖猪群生产效率降低,严重影响猪场的经济效益。本文作者对引起母猪繁殖障碍的多方面因素,包括营养因素(如饲养水平、饲料品质、断奶日龄)、环境因素(如温度、湿度、通风、光照)、疫病因素、生产技术及管理因素进行了详细阐述。 相似文献
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DENG Zhao-jing 《保鲜与加工》2005,(1):153-156
A new definition of inertia,i.e. the momentum is the measuring of inertia of matter, is proposed. The article through and etc., subjects, the correctness of the new notion of inertia:The monentum is the measuring of inertia has been demonstrated, and the unsolved contradictions of the traditional definition of inetia. And the mass is the measuring of inertia has been revealed. 相似文献
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香蕉是热带亚热带发展中国家重要的粮食作物和碳水化合物来源。但近年来,香蕉生产受到严重的病虫危害。大多数香蕉栽培品种是三倍体,生长周期长,而且不孕。由于没有种子,给繁殖和育种带来一定的困难。遗传转化技术的发展为香蕉品种的改良提供了一种有效的手段。香蕉的遗传转化方法有电激法、基因枪法、农杆菌介导法等。农杆菌介导法的应用是香蕉品种改良的一个重大突破。香蕉遗传转化的外植体也发展到多种,有原生质体,胚性细胞悬浮系,分生组织,以及横切薄片等。近几年,随着分子生物学的发展,出现了转化效率更高,重复性更好的香蕉遗传转化技术。如农杆菌和基因枪结合法,离心辅助农杆菌介导法、真空渗透技术等。这些新技术新方法的出现,必将推动香蕉产业高速发展。 相似文献
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Efficiency of water use of early plantings of sunflower 总被引:4,自引:0,他引:4
M. Auxiliadora Soriano Francisco Orgaz Francisco J. Villalobos Elías Fereres 《European Journal of Agronomy》2004,21(4):465-476
Rain fed crop production in Mediterranean environments depends to a large extent on strategies that avoid the intense summer drought. Early plantings of sunflower have given consistently higher yields in such environments, but the basis for such yield increases has not been explored. We conducted two field experiments at Cordoba (Spain) to investigate the effects of an early and a late planting date on the components of water-limited crop productivity; namely, water use (T), water use efficiency (TE) and harvest index (HI) of sunflower. The results were generalized by simulating rain fed sunflower yields, under early (1 January) and late (15 March) plantings, for a 25-year period with the aid of a simulation model of the Ceres type (OILCROP-SUN) which has been validated in Cordoba. Experimental seed yields of early plantings in 1989 and 1996 were 2.0 and 3.0 t ha−1, while late plantings yields were 1.3 and 2.4 t ha−1, for the 2 years. Average simulated yields were 2.7 ± 1.1 and 1.9 ± 0.7 t ha−1 for early and late plantings, respectively. For the 2 years, T of early plantings was higher than that of late plantings, but the response of TE and HI to planting date was not the same in the two experiments. In the simulation exercise, T and TE of early plantings were consistently higher than those of late plantings, while there were no differences in the HI for the two planting dates. We conclude that early plantings of sunflower increase rain fed yields by increasing both T and TE, while the impact of planting date on HI very much depends on the crop water stress pattern, which is quite variable from year to year even in the predictable Mediterranean environment. 相似文献
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The cotyledon and hypocotyl of eight varieties of alfalfa( Medicago sativa L. )are used to study the effect of different cultivation procedures and genotypes on embryogenic callus and embryoid induction,plant development and transplant of alfalfa.The varieties of alfalfa with high embryoid induction rate and high differentiation rate are screened. A high frequency regeneration system for alfalfa tissue culture is established:which is benifical to the gene transformation of alfalfa. 相似文献