红橘花蜜腺的发育解剖学

红橘花蜜腺环状 ,绕于上位子房基部 ,属于花盘蜜腺 .花盘所有细胞构成蜜腺 .蜜腺由分泌表皮、产蜜组织维管束组成 .据组织发生及维管束来源推测 ,花盘蜜腺是雌雄蕊基部共同起源的 .在蜜腺组织的发育过程中 ,淀粉粒和液泡呈现有规律的变化 .开花泌蜜前 ,淀粉粒急剧增大 ,通过泌蜜 ,淀粉粒由大变小 ,最后消失 .维管束伸入产蜜组织距表皮 7- 10层细胞处 .维管束末端只有韧皮部 .产蜜组织细胞 30 - 5 0层没有胞间隙 ,上方 14- 2 0层与下方细胞稍有不同 ,分泌表皮上气孔数量少且正常 .蜜汁可能由产蜜组织细胞通过由细胞壁组成的非共质体途径 ,也可能经共质体途径到达分泌表皮细胞外壁与角质层之间 .在内压作用下 ,从角质层渗透到蜜腺外面     

不同浇水处理下苜蓿丰产技术的研究

采用完全随机实验设计，对新牧1号杂花苜蓿适宜浇水时期、浇水次数及浇水量进行研究，结果表明：不同浇水处理对提高新牧1号杂花苜蓿干草产量有一定的影响，各试验处理间表现出显著差异（P〈0．05）；浇水时期中以刈割前5天浇水增产效果最好，干草产量比对照提高25．67％以上，且浇水处理增大了苜蓿干草中茎杆比例；浇水次数可以提高干草品质，且以浇二水处理效果较好，产量比对照提高18．94％以上；浇水量中以1130m^2／hm^2的处理干草产量最高，比对照提高24．92％。     

不同刈割周期对热研11号黑籽雀稗产草量及品质的影响

研究不同刈割周期对热研11号黑籽雀稗(Paspalum atratum cv.Reyan No.11)产草量及品质的影响。结果表明:间隔90d刈割周期粗蛋白质产量最高,达3897 kg/hm2;间隔75d刈割周期鲜草产量最高(135.8t/hm2);间隔120d刈割周期干草产量最高(38.6t/hm2);间隔120d刈割周期株高生长动态和分蘖数均高于其它处理;在品质方面,间隔90d刈割周期黑籽雀稗品质最好,粗蛋白质含量最高(13.13%),粗纤维含量最低(25.79%)。     

华南6号木薯的选育

华南6号木薯（Manihot esculenta Crantz,cv,M.SC6)是从OMR33-10品系自然杂交种F1无性系后代中选育而成的。其块根产量约35000kg/hm^2，比现推广品种华南205增产50%，比华南201增产48%；块根干物率为40.5%，淀粉质量分数为32.4%，分别比华南205高2.5%和2.3%。     

鸡蛋花精油提取及其成分分析

将自然光照下晒干的鸡蛋花样品采用水蒸汽提取装置提取精油,得到棕黄色的精油固体,得率为0.110%。对鸡蛋花精油进行了气相色谱-质谱联用(GC!MS)分析,从中共分离鉴定出16种成分,其中苦橙油醇、香叶基芳樟醇异构体等萜类化合物含量较高,含量分别为20.25%和10.10%,其余含量较高的成分依次为二十七烷(7.65%),肉豆蔻酸(6.73%),十六烷酸2,3-二羟丙基酯(2.98%),邻苯二甲酸二异丁酯(2.68%)等。     

中华南方常绿杨木材纤维形态特征及径向变异规律

对5株11年生的中华南方常绿杨纤维长度、纤维直径、纤维壁厚、纤维长宽比和壁腔比等纤维形态特征指标进行了系统测试。结果表明:中华南方常绿杨的年轮宽均值为7.99mm、纤维长宽比均值为67.26、纤维长度均值为0.99mm、纤维宽度均值为14.90μm,平均壁腔比为0.43、平均壁厚为4.81μm、平均腔径为11.15μm;生长轮宽度前5a呈规律性“大小年”变化、5~8a生长平缓、第9年达到峰值,之后开始下降;纤维长度的向变异应属PashinⅢ型,纤维长度呈正态分布;纤维长宽比、细胞壁腔比从髓心向外逐轮增大,在第7年后趋于近似稳定状态。     

Production of seed potatoes in Cyprus: the effects of roguing and planting date on the spread of potato leaf roll virus,tuber yield,and infestation by potato tuber moth

Summary Field experiments during 1984–6 tested the effects of planting date on the development of aphid infestations and the spread of potato leaf roll virus (PLRV) in rogued or unrogued plots of potatoes, cv. Spunta. Plantings were made each month from December to April, the customary time for planting being February. Aphid infestation in early-planted plots was severe throughout the growing season; plots planted in February were also severely infested early in the growing season but the populations later gradually declined to undetectable levels. Nevertheless, the incidence of PLRV in the latter plots was as high as in those planted in December-January. Late-planted crops escaped aphid infestation and PLRV infection, either in part (March planting) or completely (April planting). Such crops, however, were uneconomical due to poor yields and heavy losses from potato tuber moth infestation. Roguing significantly reduced the spread of PLRV in all years but its interaction with planting date was insignificant.     

Effect of leaf age on photosynthesis,carbon transport and carbon allocation in potato plants

Summary Photosynthetic characteristics, carbon allocation and partitioning of newly-fixed¹⁴C among the various carbohydrate fractions were studied in leaves of potato plants (Solanum tuberosum L. cv. Désirée) of different ages. The higher photosynthetic rate of young leaves was associated with higher levels of starch and reducing sugars. After 24 hours, in young leaves the fixed¹⁴C had been partitioned mainly to the residue and starch fractions, while in older leaves there was an increase in partitioning to sucrose and reducing sugars. The activities of the various sink organs were found to be dependent upon their distance from the source leaf. Tuber activity, however, was affected similarly by all fully expanded leaves. Although young fully expanded leaves are thought to be the major source of assimilates for tuber growth, it seems that a vast potential for contributing to plant productivity and tuber yield lies also in the older leaves, which translocate most of their photoassimilates to the tubers.     

Intercropping potatoes in early spring in a temperate climate. 1. Yield and intercropping advantages

Summary Three experiments carried out in south-east England tested the proposition that solar radiation falling on the soii (‘wasted’) until the attainment of a complete crop canopy by potato crops, could be utilized by intercropping with cabbages without detriment to the potato yields. The cabbages were established by transplanting and harvested by the time the potato crop had achieved a ground cover between 40–80%. However, almost without exception, intercropping reduced the economic yields of both component crops. The land equivalent ratio (LER) varied between 1.01 and 1.78 and the partial LER of potatoes between 0.56 and 1.11, suggesting only in the latter case was there complete absence of competition between the component crops.     

割地草在214意杨育苗中的应用技术研究

通过试验与推广总结出在杨树育苗中应用割地草最适施用时期是杨树芽苞未萌动前,最经济施用浓度为0.1%喷湿土表,除草效果90%以上,结合一次中耕除草,可基本免除人工除草。