全株玉米青贮与去穗秸秆青贮饲喂肉牛的增重效果对比试验   总被引：9，自引：1，他引：8  

崔淘气 《中国牛业科学》2002,28(3):19-21

利用蜡熟期全株玉米青贮和完熟期去穗玉米秸秆青贮,分别饲喂肉牛,进行育肥增重试验。30头供试肉牛平均分为两组,通过对比试验,其结果为:喂全株玉米青贮组头均日增重1891g,喂去穗秸秆青贮组头均日增重 997 g,经分析差异极显著(P<0.01)。将两组所耗精料、粗料及所增毛重按当时市场价分析,60 d试验结束,喂全株青贮组和去穗青贮组,平均每头获利分别为291.90元和97.02元;每千克增重费用分别为4.69元和5.28元。用全株玉米青贮饲喂肉牛效果优于去穗秸秆青贮,且适口性强,消化利用率高,增重效果明显,在平原农区应大力推广。  相似文献   

鲜食糯玉米农艺性状与鲜穗产量的灰色关联度分析     

王付娟  库丽霞  孟庆雷  赵文明 《中国农学通报》2007,23(7):253-253

以正在参加黄淮海国家糯玉米区域试验的19个新品种为材料，利用灰色关联度分析方法，对11个农艺性状与鲜穗产量进行了关联度分析。结果表明，糯玉米农艺性状与产量关联度的大小依次为穗粗﹥穗行数﹥穗长﹥株高﹥收获期﹥行粒数﹥轴粗﹥穗位高﹥鲜百粒重﹥鲜出籽率﹥秃尖长。穗粗、穗行数、穗长、株高是影响糯玉米鲜穗产量的主要因素，而鲜穗百粒重、鲜出籽率、秃尖长度对产量影响则较小。但影响鲜穗产量的主要因素在不同产量水平品种中存在一定差异  相似文献   

Simplified culture method of detached ears and its application to vernalization in wheat   总被引：3，自引：0，他引：3  

K. Kato  S. Tomo  S. Yamazaki  K. Hayashi 《Euphytica》1990,49(2):161-168

Summary The effects of the addition of sulfurous acid into culture solution and of cold treatment of the solution were examined to simplify the culture of detached wheat ears. In the simplified method, detached ears could be cultured at room temperature on the liquid medium containing 100 g/l sucrose and 0.075% sulfurous acid without any sterilization. The immature seeds in detached ears cultured by this method were treated with low temperature or with chemicals known to have vernalizing effect. The chemical treatment did not affect the chilling requirement of immature embryos, although photoperiodic response and narrow-sense earliness were reduced by kinetin and trypsin. The low temperature treatment drastically affected the chilling requirement, and fully vernalized mature seeds having normal germinability were obtained by treating the detached ears in culture with low temperature from 10 days after anthesis.  相似文献   

A reciprocal F1 monosomic analysis of the genetic control of time of ear emergence,number of leaves and number of spikelets in wheat (Triticum aestivum L.)     

J. Hoogendoorn 《Euphytica》1985,34(2):545-558

Summary A reciprocal F₁ monosomic analysis of chromosomal differences between Spica and Bersée was carried out under controlled environment conditions. Chromosomes associated with differences in days to ear emergence, number of leaves and number of spikelets were identified. The results indicated that chromosome 2B of Spica carries a photoperiod insensitivity allele at the Ppd ₂ locus. Both Spica and Bersée appear to have a vernalization insensitity allele at the Vrn ₂ locus on chromosome 5B. On chromosome 3A, 4B, 4D and 6B factors were found with major effects on earliness per se, diffeences in ear emergence and number of spikelets which were independent of photoperiod and vernalization. The possibility that these factors influence growth rate is discussed.  相似文献   

春谷幼穗发育阶段与叶龄指数关系的研究   总被引：2，自引：0，他引：2  

辛淑芳  赵福 《华北农学报》1986,(2)

经三年观察研究,十个不同熟性春谷品种的幼穗发育开始时间是随着它们生育日数长短而变化,并与拔节始期有着密切的关系.同时,春谷不同熟性品种的叶龄指数又与幼穗发育阶段呈回归直线关系.因此,春谷不同熟性品种利用其叶龄指数,求出适宜的系数,再代入改进的直线回归关系式,即可以较准确地判断出谷子的幼穗发育阶段.  相似文献   

灌水和施用钾肥对玉米果穗叶片光合特性及产量的影响   总被引：5，自引：0，他引：5  

陈建忠肖荷霞  胡铁欢刘艳涛 《华北农学报》2007,22(B10):184-186

在玉米生育期间进行灌水和施用钾肥，对玉米果穗叶片的叶绿素含量、光合强度和玉米籽粒灌浆及最终的籽粒产量均有明显的促进作用；灌水与施用钾肥之间有一定的互作效应；钾肥（K2O）的适宜施用量在90—135kg／hm^2为宜。  相似文献   

陆地棉（G．hirsutumL．）茎尖分生组织培养及其在基因导入上的应用   总被引：6，自引：0，他引：6  

吴敬音  朱卫民  佘建明  蔡小宁  朱祯  李向辉 《棉花学报》1994,(2)

陆地棉栽培品种的种子无菌发芽１～３天。将萌动种子的顶端分生组织培养在无激素或附加低浓度激素ＭＳ基本培养基上，直接再生完整小植株。从顶端分生组织到再生植株所需的最短培养时间约１０天。顶端分生组织供体种芽的萌芽天数及其所连接的胚轴长度对植株再生频率有明显影响，但与品种的关系较小，不同品种均能获得再生植株。应用基因枪轰击法将ＣＰＴⅠ基因和ＮＰＴⅡ基因的重组质粒导入到棉花茎尖分生组织，培养获得卡那霉素抗性株。  相似文献   

西藏冬小麦成穗率与气候条件的关系   总被引：1，自引：0，他引：1  

杜军  马玉才 《中国农业气象》2003,24(2):18-20

在系统分析研究西藏自治区山南地区多年气候因子对冬小麦成穗率的影响规律基础上，建立了成穗率气候模型。结果表明：山南地区冬小麦三叶一分蘖期间的平均气温偏高有利于成穗率的增加；分蘖一拔节期空气干燥将减少成穗率；孕穗一抽穗期的空气湿度为49％左右、日较差小、阴雨寡照有利于成穗率的提高。  相似文献   

Preparation on the basis of Trichoderma asperellum in the system of biological protection of wheat from Fusarium ear scab          下载免费PDF全文

Kolombet L V　 Sokolov M S　 Chuprina V P　 Schisler D A　 Samuels G J 《浙江大学学报(农业与生命科学版)》2004,30(4):394-395

During the last century, as the area of wheat grown under advanced grain husbandry has increased worldwide, so too has the importance of Fusarium ear scab (FES) (synonym, Fusarium head blight) caused by several species of the fungus Fusarium. Yield losses due to FES can total 20%-40% and more depending on climatic conditions. During the last twenty years epidemics of FES in cereals have become chronic all over the world, including the United States and Russia. The most destructive of t…  相似文献   

陕西省玉米穗粒腐病的病原菌鉴定及各分离菌分布频率     

马秉元  龙书生  李多川  李亚玲 《西北农林科技大学学报(自然科学版)》1995,23(Z2)

1992～1993在陕西省汉中、宝鸡、咸阳、安康、商洛、榆林等地区的25个县、62个乡调查玉米穗粒腐病,并采集病穗标样570份。霉坏籽粒占果穗面积1/3以上、发病严重的果穗占35.61%。对病穗标样分离鉴定结果,按出现频次计:Fusarium moniliforme占42.58%,F.graminearum 20.34%,依次还有Rhizopus nigricans(13.59%)、Penicillium sp(7.95%)、Trichothecium roseum(4.21%)、Cephalosporium acremonium(2.37%)、Olpitrichumofricanum(1.91%)、F.brachygibbosum(1.15%)、Acremoniella verrucosa(1.07%)、Bipolariszeicola(0.92%)等。串珠镰刀菌F.moniliforme出现频次占优势,是陕西省玉米穗粒腐病的主要病原菌。  相似文献