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排序方式: 共有46条查询结果,搜索用时 15 毫秒
1.
分析了玉米在破糁装置中的运动情况和轴向运动速度,实验研究了滚筒速度、纹杆数目及其上纹槽方向等对玉米破糁性能的影响,较佳参数为,滚筒转速900 ̄1000r/min(直径为340mm),纹杆数6,左旋4,右旋2。 相似文献
2.
毛百合繁殖生物学研究(Ⅲ):毛百合种子萌发特性 总被引:6,自引:1,他引:6
毛厚合花大,吴钟形,1-12朵顶生,色鲜艳,橙色,橙红色至红色。毛百合主要分布在中国并北地区,其抗寒性很强,是百合属中培育抗寒品种的优良亲本之一。研究结果表明:(1)毛百合种子萌发为留土类型,种子萌发温度范围为10-30℃,最适温度为20℃温度下,种子7-10d既开始萌动,总萌发率可达80%以上。(2)实生小鳞茎在25℃左右适宜真叶萌生,但经2-5℃低温处理1-2个月可在较短时间使95%以上的小鳞 相似文献
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Factors mainly responsible for limiting animal production in the Molopo ranching area are the poor grass species composition of the veld, bush encroachment, droughts and the poor fertility status of the soil. Data illustrating the extent to which grass species composition and grass production are affected by these factors are presented and discussed. Data from earlier attempts to .solve these problems reveal that several different directions of pasture research have possibilities in such semi‐arid areas. 相似文献
5.
黑龙江省友好木材综合加工厂Ⅱ号削片机,使用43个月其主轴完全破断。本文对主轴断口进行了微观分析,发现多处焊接缺陷和冷裂纹,疲劳扩展后,形成一环状疲劳开裂区,导致主轴疲劳强度严重降低,在事故性的较大连续冲击力下造成主轴终断。本文还进行了复合型断裂计算和剩余寿命估算。 相似文献
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结缕草种子脱落酸含量及打破休眠的研究 总被引:23,自引:4,他引:19
本研究采用间接酶联免疫吸附法测定结缕草休眠种子与打破休眠种子在发芽处理过程中脱落酸(ABA)含量的变化。在每克休眠种子中,颖苞和籽粒中的脱落酸含量分别为4.533μg和2.403μg,但以籽粒中脱落酸的含量对休眠的诱导起主要作用;休眠的解除随脱落酸含量的下降而增强。通过对休眠种子和打破休眠种子的发芽处理过程中施用外源激素发现,虽然单独施用外源激素(GA)对休眠的解除有一定的效果,但打破结缕草种子的休眠,首先必须要解除颖苞的透性障碍,然后施用外源激素才可能使结缕草种子达到其潜在发芽率。 相似文献
8.
Damaris Godinez-Vidal Mario Rocha-Sosa Edgar B. Sepúlveda-García Joel Lara-Reyna Reyna Rojas-Martínez Emma Zavaleta-Mejía 《European journal of plant pathology / European Foundation for Plant Pathology》2008,120(3):299-303
We tested the hypothesis that PAL activity in chilli plants CM-334 inoculated with Nacobbus aberrans (Na) alone or in combination with Phytophthora capsici (Pc), is lower than in those inoculated only with Pc. At 21 days after nematode inoculation, inoculated plants showed a significant
(P < 0.01) reduction of 48% in PAL activity compared to those non-inoculated in two separate experiments. In two other tests,
where plants were inoculated with the oomycete 21 days after inoculation with the nematode, PAL activity at 2, 4, 6, 8 and
24 h after inoculation with Pc was significantly higher (Tukey, P < 0.01) in plants inoculated only with Pc than in plants inoculated only with Na or both pathogens (Na+Pc). 相似文献
9.
用植物生长调节剂CPPU对猕猴桃种子进行浸种处理,处理浓度分别为0、25、50、75、100mg/L,处理时间分别为12、24、48h,然后置于25℃恒温条件下,调查供试种子的发芽率和发芽势。结果表明,不同浓度的CPPU经不同时间处理对打破猕猴桃种子休眠均有效果,浓度为75mg/L的CPPU处理48h对打破猕猴桃种子休眠的效果极显著优于其他处理,100mg/L的CPPU处理24h对供试材料发芽率的影响也极显著高于其余处理。试验结果还表明,在低浓度短时间处理的情况下,CPPU对猕猴桃种子发芽的影响虽然极显著优于对照,但显著低于高浓度长时间处理。 相似文献
10.
Lodging-related morphological traits of hybrid rice in a tropical irrigated ecosystem 总被引:1,自引:0,他引:1
M. Sirajul Islam Shaobing Peng Romeo M. Visperas Nelzo Ereful M. Sultan Uddin Bhuiya A.W. Julfiquar 《Field Crops Research》2007
Hybrid rice (Oryza sativa L.) has been proven to be effective in increasing yield potential, but lodging often limits its yield in high-yielding environments. This study was conducted to determine genotypic variation in lodging resistance and lodging-related morphological traits among hybrid and non-hybrid check varieties, and to identify the key morphological traits associated with lodging resistance. Lodging behavior of 16 rice genotypes, including 12 hybrids and four inbreds, was studied at the International Rice Research Institute farm during the 2004 wet season (WS) and 2005 dry season (DS). Grain yield and visual score of lodging were determined at maturity. Lodging-related morphological traits were measured at 30 days after flowering. Large genotypic differences in lodging-related morphological traits were observed. Among these traits, dry weight per unit length, breaking resistance, and lodging index (bending moment/breaking resistance × 100) of lower internodes were significantly correlated with visual score of lodging. Several hybrids demonstrated high lodging resistance although their average plant height was over 120 cm. The lodging-related morphological traits and visual score of lodging in these hybrids were comparable with those of the non-hybrid check varieties with strong lodging resistance. These results suggest that increases in dry weight per unit length and breaking resistance of lower internodes are primary targets for reducing lodging index, thus improving overall lodging resistance of hybrid rice in a breeding program. 相似文献