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环剥对苎麻开花的诱导效应 总被引：1，自引：1，他引：0
研究了５个品种（系）、３个环剥时期及两种密度下,环剥对苎麻（短日植物）开花的诱导效应。结果表明：环剥能诱导头麻成熟期已有花芽分化的品种（系）于５至６月的自然长日下只开雄花,比短日（１０小时光照）处理株花蕾多、花期长,但环剥不能诱导同等条件下无花芽分化的品种开花。对成熟茎环剥比成熟前环剥、稀植比密植表现出更好的诱导效果。 相似文献
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1．巧法环剥 对密植旺树，在主干离地面15～25厘米处环割两圈，将中间环皮剥去，宽度是枝干周长的1／15～1／10；对稀植旺树，在中心枝干或临时旺枝基部按上述方法进行环剥。环剥时注意3点：一是时间。从6月中旬到8月上中旬均可进行。二是深度。环剥应深至木质部，去皮宽度不要任意加大，以免影响树体生长。三是用具。环剥一般选用圆形或半圆形环割刀结合刀刃进行。另外，环剥后要将伤口处理干净，以利其愈合。 相似文献
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以火焰无核葡萄为试材,通过采用不同宽度、不同部位的环剥技术,研究环剥对葡萄穗长、穗宽、粒质量、粒长等性状的影响。结果表明,不同宽度及不同部位环剥对葡萄果实性状有较大影响,可显著增加葡萄果穗与果粒长度,增大果粒质量,特别能够显著提高葡萄含糖量。不同宽度环剥处理之间,8 mm环剥宽度的效果优于2 mm和5 mm;不同部位环剥处理之间,结果枝基部环剥效果较结果母枝基部显著。 相似文献
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为了解卵叶青藓可能具有的化感效应及其作用机制,以卵叶青藓配子体水提取液为处理液,以玉米种子为受试对象,通过测定不同浓度梯度卵叶青藓水提液对受试种子萌发及幼苗生长的影响,初步阐明卵叶青藓可能具有的化感潜能.结果表明:卵叶青藓配子体水提液对玉米种子发芽率有较大影响,且总体趋势表现为提取液浓度愈高,对其种子萌发率影响愈大,处理组玉米种子萌发率显著低于对照组(p＜0.05);卵叶青藓水提液对玉米幼苗生长的影响表现在对苗高与根长的抑制方面.随着水提液浓度的增高,玉米幼苗根长逐渐变短,在80 mg/mL处理下达到最短,且与对照间差异显著(p＜0.05);对玉米幼苗根部发育状况有较强的影响,即随着水提液浓度的提高,生根数目逐步减少,直至浓度为80 mg/mL时达到最少.实验中,玉米幼苗鲜重及干重均随着提取液浓度的升高而减小,尤其是幼苗于重,在提取液浓度达到40 mg/mL时达到最小.随卵叶青藓提取液浓度不断增高,玉米幼苗叶片总叶绿素含量和叶绿素a含量逐步下降,均在80 mg/mL时达到最低,而叶绿素b在5 mg/mL时反而略高于对照组,在10 mg/mL时达到最低.上述结果表明,卵叶青藓具有一定的化感潜能. 相似文献
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为控制菊苗高度、解决缺苗而繁殖失时等问题,笔者于去年9月1日与同事一道进行了一次尝试。我们根据压条原理,在环剥高压的基础上,采用线扎高压法对36株菊苗进行了压条处理,当月26日前后即上盆栽植,株株成活。具体做法是: 首先选取无病健壮母株,在顶梢下部第6～8张叶片的叶节下方1厘米处,用小刀轻轻环刻一刀(稍破其皮),然后用粗细适度的白线将环刻 相似文献
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Chang Guanghui Wang Jinge Yang Nianzeng 《保鲜与加工》1992,(5):8-11
The rolling cone enveloping hourglass worm pair has been successfully developed, in which there is almost only rolling friction between the meshing tooth surfaces, and both the worm and wormwheel have hard surfaces. Such a new type of hourglass worm pair is particularly-favorable for power transmission. This paper presents the design. manufacting and testing of this worm pair. 相似文献
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THis Paper derscribes a novel all-fiber compensation network with three access-couplers for improving the stability of amplitude modulated fiber optical sensors. and its optimumstructure which is indepent on environment effects. We also describe the sealing method of the com-pensation network and the experiment of its coupler parameter variation caused by tempertare andvibration. The expreiment results showed that the compe nsation network can effectivelv resist themeasurement error affected by the in tensity variation of the optieal souce and other transmission loss. 相似文献
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渗透胁迫诱导水稻幼苗的氧化伤害 总被引：41，自引：1，他引：41
水稻幼苗在渗透胁迫下，随着胁迫强度的增加及时间的延长，O2和H2O2大量产生，膜脂过氧化加剧，细胞膜的完整性受到破坏，离子大量外泄；严重渗透胁迫亦使叶绿素——蛋白质复合体结合松弛，叶绿素含量明显降低。活性氧清除剂α-生育酚、抗坏血酸及甘露醇可阴抑渗透胁迫所诱导的丙二醛增生，减少叶绿素的氧化破坏。这些结果表 相似文献
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This paper presents a reactive power optimization method which combines thelinear programming model with secure correction. In correction. this mOdel presents a new idea inwhich the feasible control region of con trol variables is resolved by over constrained state varlables. This method is quick and reliable and overcomes oscillation of a general linear programming model. 相似文献
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用磷化铝片对储藏在房式仓（仓容５１６ｍ３）中的４００ｔ散装小麦进行熏蒸。储 不小麦水分为１１．５％,储藏平均温度为２９．３℃,小麦用ＰＶＣ（厚度０．１２５ｍｍ）复盖。熏 蒸期间用磷化氢检测管测定ＰＨ3浓度。采用１．０３ｋｇ磷化铝片（可释放０．３４ｋｇ磷化氢） 分成小包进行熏蒸,磷化氢最高值为 １． ０ｍｇ／Ｌ。熏蒸 １６天的 ＣＴ值为 ２１３ｍｇ· ｈ／Ｌ。用 敏感和抗性品系的米象和谷蠹进行生物试验表明．熏蒸１个月后所有的成虫都死亡;熏 蒸４２天所有中度抗性的谷蠹没有发现Ｆ１代成虫出现．米象的印和蛹不能发育为成虫。 相似文献
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箱式通风与揭膜相结合提高降温效果的研究 总被引：1，自引：0，他引：1
采用箱式通风装置对储粮进行通风,并结合由远而近,等距离揭膜的办法,有效地降低了米温,能耗低于其它一些通风技术。试验测试了箱式通风全过程参数及其变化规律。 相似文献
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The feasible control problem is presented for the day-operation of the Three-Gorge Caseade Hydropower Station. The significance of the problem is explained. Basic propetties ofthe problem and the approaches to study it are discussed. Two methfods are given for solving theproblem. which are calculus of variation and linear programming. In the former. the Euler equationwith time-lag and the generalised two-point boundary conditions are obtained and the correspondingpractical implication is interpreted. In the latter. the rationality for the discrete model is exptainedand the computalional details are given for the implement software. some questions which should bepaid much attentfon and the corresponding propeels are prasented based on the numerical results andtheoretical analysis 相似文献
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磷化氢缓释、间歇、气流、低氧综合熏蒸的探讨 总被引：3，自引：1，他引：2
探讨了磷化氢缓释、间歇、气流和低氧综合熏蒸的原理和方法，并通过实践 证明这种综合熏蒸方法杀虫效果好．可杀死卵、蛹和抗药性较强的虫种，可在较长时间 内避免重复熏蒸。 相似文献
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A diallel cross from nine early-maturing lines of maize was grown in northern Germany during 1981 and 1982 in order to study the genotypic variation of shoot biomass at early and late stages of development. Inbred lines had been chosen from breeding programmes for early and medium early cultivars. Nevertheless, the date of maturity varied between them which can have some influence on the correlation between plant parameters. Plants were harvested at the fourth and sixth leaf stages, at anthesis and at maturity. S.c.a. effects were highly significant for traits during the vegetative stage. G.c.a. effects were highly significant for traits of the mature plant including grain yield components. The ratio of g.c.a. to s.c.a. effects for shoot biomass was dominated throughout the growing season by s.c.a. effects. Hybrids from the diallel cross had a superior growth rate until the fourth leaf stage; thereafter, relative growth rates of lines and hybrids were similar for the average of both groups until maturity. The correlation of g.c.a. effects and s.c.a. effects between shoot biomass throughout the season revealed that no significant relationship existed between early and late stages. G.c.a. and s.c.a. effects for grain yield components, with the exception of hundred kernel weight, were negatively correlated with shoot biomass at an early stage while correlation was positive at maturity. This would probably make it a difficult task to improve shoot growth and grain yield components simultaneously through the season. 相似文献