不同相思根瘤菌株接种厚荚相思幼苗效应的比较

从不同立地条件的6种相思林中采集根瘤并分离14株根瘤菌,将其接种到厚荚相思幼苗。结果表明,从广西本地分离的土著根瘤菌比对照菌株L1(从中国林科院引进的外来优良菌种)有更好的共生效应。从综合效应看,多数菌株接种的厚荚相思幼苗与对照相比,其苗高生长量增加4.5%～18.6%,地径生长量增加2.5%～46.8%,固氮酶活性提高7.6%～241.8%,叶绿素含量提高11.0%～19.1%,叶片硝酸还原酶活性提高3.3%～34.4%,叶片含氮量提高7.4%～43.8%,叶片含磷量提高9.1%～72.7%,叶片含钾量提高8.3%,叶片含钙量提高7.3%～41.5%,叶片含镁量提高12.5%～25.0%,叶片含铁量提高10%以上。

多效唑调控油菜幼苗效应及增产效果的研究

油菜幼苗期应用多效唑,能控上促下,壮根增叶,控高脚控柄长,能使植株体内组织结构发生变化,叶片蜡质层增厚,气孔开度变小,栅栏组织层数增多、排列紧密,培育出抗逆性较强的矮壮苗。油菜以幼苗三叶期(苗床内)喷施浓度150ppm多效唑调控效果最好,常年亩增产菜籽10％左右。

稀土配合物对大豆幼苗防护(铅)效应试验

以盆栽试验研究了Pb对大豆苗期素质的影响,及稀土配合物La(镧)-Gly(甘氨酸)的防护效应。试验结果表明,根施500mg·L^(-1)PbAc_2,严重抑制大豆幼苗生长。叶面喷布30mg·L^(-1)La-Gly1次,可减轻Pb对大豆幼苗造成的伤害。

Study on Effect of Age of Seedlings Transplant on the Performance of Tomato （Lycopersicon esculentum） in a Southwestern Nigeria Location

Field trials were conducted at the experimental site of the Department of Plant Science of the University of Ado Ekiti, Nigeria during the 2005 and 2006 cropping season to examine the effects of age of transplanting on the performance of tomato Lycopersieon esculentum L. Establishment count %, plant height stem girth, earliness to flower, and fruit yield were significantly affected by the ages at which the seedlings were transplanted. The 2 and 3 weeks after sowing transplants were identical in performance and gave the highest number of field establishment count, growth increase, and yield. The 4WAS transplants performed better than the 5WAS transplants. It is concluded that a delay in early transplanting of tomato seedlings after 4WAS could lead to a very high reduction in tomato yield in the study area.