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The ability of cold resistance of almond was analyzed by the formulation of LT50, the investigation of over-wintering, the measurement of water content in dormant period and the analysis of anatomical structure in the annual branches of two introduced varieties. The results showed: the LT50 of Fritz, Nonpareil and CK was -24.88℃,-20.56℃ and -17.15℃, respectively; the index of chilling injury of these varieties was 10%, 45% and 87%, respectively; and the classification of cold resistance was in turn high resisting, moderate resisting and easily shoot-shriveling.

通过对两个引种扁桃扶兹和那普瑞尔1年生枝条的半致死温度(KT50)拟合、越冬调查、休眠期的含水率及其解刨结构的分析,对扁桃的抗寒力进行了研究,结果表明:Fritz、Nonpareil及CK1年生休眠枝的半致死温度(LT50)分别为-24.88℃、-20.56℃和-17.15℃;冻害指数分别为10%、45%和87%,抗冻害评级依次为高抗、中抗、易抽。

The results showed that N uptake of diploid andtetraptoid were lower than those of Hexaptoid and octoploid at over wintering and afteranthesis, but the capability was higher from jointing to anthesis. Diploid and tetraploid hadlower N distribution in leaf, and had higher N distribution in else vegetative parts at anthesis. And had lower N distribution in grain, higher N distribution in else vegetativeparts at mature. The N transfer amounts and its contribution to grain N accumulation ofDiploid and tetraploid were higher than Hexaploid, but the NTE and contribution of Naccumulation to grain N were lower.

结果表明,与普通小麦和小黑麦相比,二倍体和四倍体材料在越冬前和花后氮素吸收能力较低,在拔节到开花期间较高;开花期氮素在叶片中的积累较少,其他营养器官积累较多,成熟期营养器官中的氮素分配较高,籽粒中氮素分配较少;具有较高的氮素运转量,但运转效率比较低;花后营养器官氮素运转对籽粒氮素积累的贡献率较高,花后吸收氮素的贡献率较低。

The survival of oospores which were produced in the media was assessed after a winter. The methods promoting the oospore germination and the factors affecting the oospore germination were also investigated. Identfication of mating type, resistance to metalaxyl and isozyme genotype were performed on the F1 generations and parental isolates of oospores.

对马铃薯晚疫病菌在培养基上产生的卵孢子越冬后的存活能力、诱导卵孢子萌发的方法、影响卵孢子萌发的因素和卵孢子亲本及F_1代菌株的交配型、对甲霜灵抗性和同工酶基因型进行了初步测定和研究。

Use the method such as market purchasing, pool cultivating overwinter and using oxytocic to make technical study on breeding Pelteobagrus fulvdrace by manual work.

采用市场收购、塘越冬养殖、物催产的方法,进行黄颡鱼人工繁殖技术研究。

In this study, Philodendron andreanum leaves become yellow and green in winter, Ornamental Value reduced as background, Study of foliar fertilizer of nitrogen fertilizer on the growth of new leaves and Ornamental leaves changes in leaf chlorophyll content and Electrolyte leakage.

佘波1,刘瑞霞1,张吉立21山西林业职业技术学院,太原030009;2大庆职业学院黑龙江大庆163255本试验以喜林芋越冬中叶片变黄绿,观赏价值降低为背景,研究叶面喷施氮肥对新生叶片生长以及观赏叶片叶绿素含量变化,电导率变化情况。

The results showed that there were two generations in one year, and there were 6~8 instars in duration of larvae's development. Larvae over-winters under bark or in base of tree. Adult were phototaxis and active on night.

结果表明:该虫在吴旗县一年发生2代,以幼虫在粗皮下或树基越冬,幼虫6~8龄,具吐丝下垂习性,在阴坡立木被害重于阳坡,成虫夜间活动,有趋光性。

Serious aridity probability of wheat field was lower in early Spring and late Autumn.

早春和晚秋麦田重旱发生概率较低,秋季是陇东麦田土壤水分含量最高的时期,晚秋2m土层平均含水量超过早春,土壤水分于秋季恢复平衡,晚秋-早春,即越冬期降水量小于土壤蒸散量,土壤水分有一定损耗。

The winter zoology environment with this favorable area is the fundamental condition that big procuress perchs in this live through the winter.

该区域良好的冬季生态环境是大鸨在此越冬栖息的基础条件。

Psylla chinensis Yang et Li is distributed in Northeast, North and Northwest of China and Shandong, Anhui, Henan Province, etc.. It damages pear.

生活习性:在辽宁一年发生3代,河北3代~5代,山东4代~6代,以成虫在树皮缝、杂草、落叶层及土缝中越冬

In mid- March and mid- May when the Psylla chinensis adults of the generation of winter and the first generation become richer, foundation function had been done when several control measures had been carried on to prevent the pests.

结果表明,在中国梨木虱越冬代和第一代成虫发生盛期实施冬季清园、刮树皮并树干涂抹石硫合剂、植物源药防治和种植趋避植物等多项措施可以有效减少梨木虱发生。

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