共查询到20条相似文献,搜索用时 62 毫秒
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我场是江苏大华种业制种玉米繁育基地。经过二十多年玉米制种实践 ,逐步总结出一套完整的制种技术 ,亩产由原来的 15 0 kg逐步上升到 35 0 kg左右 ,其中高产品种高产田块亩产突破 5 0 0 kg。总结多年来制种的成功经验 ,主要应把握十项关键技术。1 选择中高肥力田块制种是获得高产的基础制种田选择地势较高且平坦 ,排灌方便 ,肥力较好的脱盐旱作茬口 ,能做到一水全苗 ,快发稳长 ,以充分发挥其增产潜力。2 确保隔离区是保证纯度的前提不同品种制种空间隔离距离不得少于 5 0 0 m,隔离区内更不能种植其它玉米 ,以防异品种间串粉混杂。3 严格… 相似文献
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Ⅱ优084是江苏丘陵地区镇江农业科学研究所用镇恢084与Ⅱ-32A配组而成的高产抗病杂交籼稻新组合。2001年4月通过江苏省农作物品种审定委员会审定。2001-2002年连续2年我公司在刘前村制种,制种面积80hm2,平均产量3.75thm2,高产田块可达6.75t。现将其高产制种技术总结如下。1亲 相似文献
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新疆玉米密植高产制种技术 总被引:1,自引:0,他引:1
随着玉米制种基地的西移,新疆玉米制种面积迅速扩大,已成为我国重要的制种基地.新疆地处欧亚大陆腹地,光照充沛,雨量稀少,人工灌溉,田块集中,病虫害轻,有着玉米大田生产与制种得天独厚的优势.近年,兵团农四师集高密度种植、化学控制、地膜覆盖、精量点播等关键技术为一体.探索形成了玉米密植高产制种技术体系,2007年在伊犁兵团62团制种0.99hm2,取得平均667m2单产767.45kg、最高单产862.75kg的全国玉米制种高产纪录.现将其技术要点进行总结: 相似文献
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我国蔬菜产业和科学技术的发展与展望 总被引:1,自引:0,他引:1
1 我国蔬菜产业的发展现状蔬菜是人们日常生活中不可缺少的副食品,也是我国目前种植业中最具活力的经济作物。改革开放以来,随着市场经济的发展,农产品产销体制的不断改革和完善,特别是1988年实施“菜篮子工程”以来,蔬菜产业得到了蓬勃发展。1.1 播种面积1987~1999年,全国蔬菜播种面积由533.3万hm2,发展到1333.3万hm2,增长139.5%。1.2 总产量1987~1999年,全国蔬菜总产量由1.55亿t增加到4.05亿t,增长161.3%,使年人均鲜菜占有量达到330.7kg(世界各国人均105kg…… 相似文献
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Oil and protein crops are of growing importance in cropping systems. This study was carried out to compare oil crops of linseed, rapeseed, sunflower and protein crops of faba bean and white lupin for grain production, residual plant dry matter and nitrogen. Two field experiments with either oil or protein crops were conducted in 1993 and 1994, respectively. Total dry matter production, grain yield, residues, N concentrations and mineral N in the soil were measured. Dry matter production and distribution as well as N uptake and residues varied greatly among species and between years. In 1993, oil crops gave up to 3 t ha−1 grain and 16 t ha−1 residues with sunflower, while in 1994 up to 5 and 11 t ha−1, respectively, were recorded with winter rape. Protein crops showed an opposite reaction in years. Nitrogen uptake and residual N amounts were correlated with dry matter production. Plant residues of oil crops contained 20–140 kg N ha−1; those of protein crops up to 80 kg N ha−1. Despite the variation of residual plant N the variability of mineral N in the soil at harvest was hardly influenced by crops and amounted to only 20–50 kg NO−3-N ha−1. 相似文献
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LI Zhi-liang~ 《保鲜与加工》2004,(7):82-85
Some novel concepts of chemomics/molomics are proposed including hydrocarbomics, alcophenomics, carboxomics, pepitomics, metabonomics, etc. like genomics, protomics and glycomics in bioomics. Some examples are given to demonstrate the chemomics and/or molomics methodology and technology based chemoinformatics and bioinformatics and their wide applications in Chemistry and Biology. 相似文献
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Acidity and sweetness in apple and pear 总被引:2,自引:0,他引:2
Summary Sweetness and acidity in apple and pear inherit independently and can be organoleptically evaluated separately, but less accurately in pear than in apple. For breeding purposes an analysis of fruits for acidity and sweetness with pH indicator paper and a hand refractometer is to be prefered to the organoleptic method.In apple, the acidity-decreasing with time-of the unripe fruit was already strongly indicative of that of the eating-ripe fruit; sugar-increasing with time-not before the fruit was picking ripe. Sugar content in apple and pear, and the pH in pear, appeared to be normally distributed; the pH in apple showed a segregation into an acid and a low-acid group, which occurred in both the unripe and ripe stage. The segregation ratio between these groups was found to be highly variable. On the whole, the mean acidity and sugar content of apple and pear progenies is significantly determined by that of the parents. Most of the observations made did not support the theory that low acidity in apple is determined by one recessive gene. The relationship between the pH of leaf juice and fruit juice in apple may offer a possibility for pre-selection. 相似文献
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以Y05-222A和Y06-136R杂交得到的135株F2群体为研究材料,测定过氧化物酶(POD)、超氧化物歧化酶(SOD)、脯氨酸(Pro)、过氧化氢酶(CAT)、可溶性蛋白和丙二醛(MDA)等6个生理指标,并进行方差分析、相关性分析和通径分析,对F2群体进行偏度及峰度分析。结果显示,以上6个生理指标在F2群体中P>0.05,分布频率符合正态分布,同时存在双向超亲分离现象;相关性分析和通径分析显示,这些指标与抗盐碱系数均呈极显著相关(正相关或负相关),且相关系数与总间接通径系数方向一致。POD活性的直接通径系数为0.5003,可见POD直接影响抗盐碱性;CAT活性和Pro含量的直接通径系数分别为-0.1317和-0.0384,间接影响抗盐碱性;SOD活性、MDA及可溶性蛋白含量直接或间接影响抗盐碱性。POD、SOD、Pro、CAT、可溶性蛋白和MDA各生理指标的抗盐碱作用表现为POD>CAT>Pro>可溶性蛋白>MDA>SOD。叶片数、株高、茎粗和盘径与抗盐碱系数呈极显著正相关,其相关性表现为叶片数>盘径>株高>茎粗。以上结果可为研究油用向日葵抗盐碱性提供一定的理论基础。 相似文献
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种子萌发是一种关键的生态和农业性状,由调控种子休眠状态和萌发潜势的内在和外部信息所决定,在植物随后的生长发育和产量中起着极其重要的作用。休眠是指种子在合适的条件下暂时不能萌发。乙烯是一种简单的具有多种功能的气体植物激素,在分子、细胞和整体植物水平调节植物的代谢。在适宜和逆境条件下,乙烯通过与其他信号分子的相互作用影响植物的行为。本文主要综述乙烯的生物合成与信号、乙烯在种子萌发和休眠释放中的作用以及乙烯与植物激素脱落酸和赤霉素的相互作用;并提出了需要进一步研究的科学问题,试图为解释乙烯调控种子萌发与休眠的分子机制提供新的研究思想。 相似文献
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为了研究谷子和小麦的淀粉、蛋白质结构、性状的差异,探索改良谷子品质的新思路,通过籽粒总蛋白提取法提取小麦与谷子的总蛋白,通过小麦谷蛋白提取方法提取小麦与谷子的谷蛋白,通过醇类物质提取小麦和谷子中的醇溶蛋白,并通过SDS-PAGE对总蛋白及谷蛋白条带进行鉴定、A-PAGE对醇溶蛋白带谱进行鉴定,并通过扫描电镜观察籽粒内部结构,分析小麦与谷子蛋白和淀粉的结构差异。结果表明,谷子谷蛋白含量低,存在一定量的醇溶蛋白,且存在一定的多态性;小麦淀粉包含A、B、C 3种淀粉粒,淀粉体间隙紧密填充蛋白体,谷子淀粉体呈多边形,体积小于小麦淀粉体,且仅含有2种类型的淀粉粒。谷子、小麦的淀粉类型、谷蛋白含量存在明显差异,醇溶蛋白具有品种间特异性,谷子的醇溶蛋白带谱数量明显低于小麦,为从淀粉发育、蛋白质含量等方面改良谷子品质提供了新的思路。 相似文献