杂交水稻制种田“九二0”使用技术

杂交水稻制种高产稳产的前提是父母本花期和花时相遇理想。但是在制种生产上，常常因多种原因造成父母本花期不能完全相遇，同时由于父母本开花习性不同，花时也难以相遇。有的组合盛花时间相差３０ｍｉｎ以上，或者开花高峰期不明显，不育系出现不同程度的包颈现象，柱头...     

几种常用花期调节方法对恢复系的调花效果及其对花粉活力的影响

杂交水稻制种过程中,花期相遇好坏是影响制种成败及种子质量的关键,比较了在杂交水稻制种生产上的几种常用调花方法的效果以及对花粉活力的影响。制种时可根据各组合的实际花期相遇状况及亲本特性采取适宜的花期调节方式,减少由于花期不遇对产量和质量造成的影响。     

汕优63夏制父母本调花的关键技术浅析

杂交水稻制种父母本花期能否相遇及相遇时间长短,是制种成败、产量高低的关键。为了达到理想花期相遇,必须在营养生长期和幼穗分化期对父母本的花期进行科学预测和调整。１科学预测花期,确定父母本播差１．１选择好最佳抽穗扬花期和父本播期在我县配制汕优６３组合,父...     

影响玉米杂交制种花期不遇的因素及调节措施

玉米杂交制种生产过程中．常因为父母本花期相遇不良，致使制种产量下降，甚至绝收。为避免这一现象的发生．在制种生产过程中准确掌握花期动态及影响花期的因素，及时采取促控措施，才能确保花期相遇良好，保证制种成功。     

中浙A系列组合制种限制因子及高产技术

抽穗期温湿度不适宜(低温阴雨或高温干燥)是中浙A所配组合制种花期相遇但异交结实率低、制种产量不高的主要原因。结合生产上大面积制种实践,提出了中浙优系列组合高产制种的主要技术措施。     

籼型不育系粤丰A生物学特性及高产制种技术研究

对籼型不育系粤丰A进行了生物学特性观察、配组试验及大面积制种技术调查,结果表明,粤丰A对"九二○"反应钝感,丰优系列组合制种"九二○"应掌握在粤丰A见穗0～5%时割叶并连续喷施为宜,总用量为600 g/hm2左右;粤丰A抽穗后2～3 d才开始开花,丰优系列组合制种的最佳花期相遇标准为母本早父本3 d始穗,可实现盛花期相遇.在此基础上,总结了粤丰A系列组合的高产制种技术措施.     

三系杂交水福制种花期不遇的原因及对策

父母本花期相遇是三系杂交水稻制种高产的关键。重点分析了影响杂交水稻制种花期不遇的主要因素,根据多年制种实践总结了三系杂交水稻制种花期相遇不理想的主要调节技术。     

玉米制种花期预测及调控技术

在杂交玉米制种中,父母本能否协调生长,达到花期相遇良好,这是杂交玉米制种成败的关键,因此,正确搞好花期预测,采取积极调控措施,对保证杂交玉米制种成功,提高制种产量具有非常重要的意义。１花期不遇或相遇不良的原因在杂交玉米制种过程中,造成花期不遇或相遇不...     

三系杂交稻华优54亲本生育特性初步观察

华优５４的亲本华农Ａ与其恢复系Ｔ５４生育期差距短，出叶速度相近，每穗花期和每日花时相遇率较高，且华农Ａ柱头生活力强，有利于调节制种田花期相遇，提高制种产量。因此，华优５４是１个具有高产制种潜力的新组合     

杂交水稻制种花期不遇大调整技术研究

杂交水稻制种花期相遇是否良好是决定制种成功与否的关键,在花期偏差10 d以上时,采取大调整技术可以确保花期相遇.     

豫北优质大豆产业发展策略

针对豫北地区的大豆生产现状，从气候、土壤、品种、生态因素及市场需求等方面提出了优质大豆的发展策略与途径。     

Comparisons of methods of scheduling irrigations of potatoes

Irrigation of Netted Gem potatoes was scheduled during three growing seasons by three methods: (a) when plants displayed first visual symptoms of moisture stress, (b) when indicated by a soil moisture budget involving estimated evapotranspiration, and (c) on the basis of tensiometer readings of soil moisture suction. When the tensiometer method of scheduling was used, the mean yields of tubers were 55.0 and 25.8 cwt/acre (6160 and 2890 kg/ha) higher than those obtained with the other two scheduling methods. Methods did not affect the specific gravity of potatoes. Method (a) scheduled irrigations least frequently. Scheduling by the budget method was not always adequate because it was based on the assumption that the crop extracted water from a constant 4 ft (1.2 m) profile from planting to full vegetative growth. In one year the budget method scheduled the first irrigation earlier than necessary and delayed the second irrigation during a critical period of crop growth. From full vegetative cover to harvest the irrigation schedules were alike for both the budget and tensiometer methods.     

吉林省平安农业科学院大豆所大豆研究工作报告

1　吉林省平安农业科学院大豆研究工作简介吉林省平安农业科学院大豆研究所 ,设在吉林省长春市西安大路种子大厦内。现有科技人员 6人 ,其中研究员 2人 ,农艺师 2人 ,技术员 2人 ,定向培养研究生 2人。大豆研究所的主要任务是选育稳产、高产、优质及抗病虫大豆新品种 ;同时密切     

湖南沅陵4种绿茶品质成分分析

以长沙县高桥相同嫩度茶鲜叶原料采用卷曲形毛尖茶加工工艺制绿茶为对照,分别对沅陵县齐眉翠峰、凤娇碣滩茶、干发茶和军大坪茶4种绿茶的主要生化成分与感官品质进行初步分析。结果表明,沅陵4种绿茶的茶多酚总量28.76%~30.34%,游离氨基酸总量2.35%~3.22%,咖啡碱含量3.00%~3.63%,水浸出物含量37.26%~40.07%,可溶性糖总量5.46%~5.65%,可溶性蛋白含量1.50%~1.74%,类黄酮化合物总量1.16%~1.79%,叶绿素总量1.36%~2.01%,儿茶素总量13.53%~16.20%。与对照相比,4种绿茶的茶多酚、可溶性糖和儿茶素总量均高于对照,除齐眉翠峰外其余3种茶样水浸出物和叶绿素总量均高于对照,除干发茶外其余3种茶样类黄酮化合物总量均高于对照。     

Analysis of nutritional components of eight famine foods of the Republic of Niger

In the western Sahel, indigenous plants become important staples when cereal harvests are inadequate to support populations inhabiting that region of Africa. The purpose of this study was to assess the nutrient content of several of these edible wild plants. The leaves of the following seven plant foods were analyzed: Ziziphus mauritiana, Cerathotheca sesamoides, Moringa oleifera, Leptadenia hastata, Hibiscus sabdarifa, Amaranthus viridi, and Adansonia digitata. The fatty acid, vitamin E, carotenoid, selected mineral and amino acid contents of these plant foods were determined. These same analyses were performed on the fruit of the Adansonia digitata. In quantitative and qualitative terms, Amaranthus viridis was found to be an excellent source of protein. Its amino acid composition compared favorably to that of a World Health Organization (WHO) protein standard. It also contained considerable amounts of the two fatty acids that are essential in humans (linoleic and -linolenic) and a number of minerals including iron, magnesium, calcium and zinc. The leaves of Hibiscus sabdarifa contained an appreciable quantity of protein the composition of which was comparable to the WHO standard. The mineral content of the leaves of this plant was also exceptionally high; noteworthy was its high zinc content. H. sabdarifa also contained significant quantities of the two essential fatty acids. Ziziphus mauritiana was an excellent source of the essential fatty acid linoleic acid and several of the metals including iron, calcium, magnesium and zinc. Its content of other essential nutrients, however, was rather low. In general, Adansonia digitata leaves were nutritionally superior to the fruit of the tree; however, the fruit did contain useful quantities of potassium, phosphorus, zinc and -linolenic acid. The Leptadenia hastata leaves were an especially good source of lutein and -carotene. These data should be useful to the people who inhabit the western Sahel in helping them devise healthy diets during times when cereal staples are in short supply.     

防治水稻潜叶蝇的药剂筛选

通过对防治水稻潜叶蝇不同药剂、不同用量的田间对比试验,结果表明,32 g/kg的35%丁硫克百威拌种预防潜叶蝇效果最好,药效可达55 d以上,适宜在生产上推广应用。     

狗牙根诱变后代抗寒性评价

通过电解质外渗法和匍匐茎恢复试验对‘阳江’狗牙根及其12个通过形态鉴定选出的坪用价值高且花序密度低的诱变后代进行抗寒性鉴定。电解质外渗法结果表明:诱变后代间的抗寒性具有较大差异,其叶片半致死温度(LT₅₀)的变异范围为-7.6～-0.2℃(最低值与最大值相差7.4℃);参试材料抗寒性由强到弱依次为M18>M4>M26>M28> M22>阳江>M29>M31>M10>M37>M16>M1>M25,其中,有5个诱变后代抗寒性优于亲本,分别是M18、M4、M26、M28、M22。匍匐茎恢复实验结果表明:诱变后代M1、M22、M26、M31、M25在0℃和-5℃低温胁迫后的恢复生长率都高于亲本,恢复能力均优于亲本;M10、M37、M28在-5℃低温胁迫下,恢复生长能力低于亲本,抗寒性相对较弱,M16和M4在0℃和-5℃低温胁迫下,恢复生长率都低于亲本,抗寒性明显弱于亲本。综合2种方法鉴定结果显示:诱变后代M1、M25的恢复能力较强;M4、M28的叶片抗寒性较好,青绿期较长;M22、M18、M26的叶片抗寒性和匍匐茎恢复能力均较强;M29,M31的叶片抗寒性和匍匐茎恢复能力与亲本相似;M10、M16、M37的叶片抗寒性和匍匐茎恢复能力均较弱,整体抗寒性较弱。     

12份白花泡桐材料亲缘关系的ISSR分析

以‘福桐’、‘绿桐’2个无性系与10个不同种源的白花泡桐个体为研究对象，采用ISSR分子标记对12份白花泡桐材料的亲缘关系进行研究，并利用DPSv3.01进行聚类分析。结果表明：10条引物共扩增出66条条带，其中有37条多态带，多态性比例为56.1%。根据ISSR聚类分析结果，在遗传距离为0.35时，12份白花泡桐材料可分为5类，第1类为‘福桐’无性系与河南、河北种源个体；第2类为‘绿桐’无性系与湖南、湖北、江苏种源个体；第3类为浙江、广东种源个体；第4类为江西、福建种源个体；第5类为广西种源个体。此结果     

龙眼种质资源果实经济性状的稳定性评价

为了探讨龙眼(Dimocarpus longan Lour.)种质果实性状的稳定性,连续3a对40份不同基因型龙眼种质果实数量性状的年际间表现进行测定比较。结果表明,在气候条件差异较大的不同年份,单果重、果皮重、果肉重、种子重、果皮厚、可食率、可溶性固形含量等果实性状均表现丰富的多样性,并存在年际间的显著或极显著水平差异,气候条件对果实数量性状有显著影响;不同性状的稳定性有差异,其中可食率的稳定性最高,其次是可溶性固形物含量。通过聚类分析,可将40份龙眼种质按果实性状稳定性分成7类。