纹杆轴流式玉米破糁装置     

黄向东  赵学笃 《农业机械学报》1995,26(3):45-50

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   

An investigation of the veld problems of the Molopo area: I. early findings     

C. H. Donaldson  D. M. Kelk 《African Journal of Range and Forage Science》2013,30(1):50-57

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   

削片机主轴断口分析与断裂强度     

方广盛  王建平 《东北林业大学学报》1990,18(6):109-115

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   

六点挤压式核桃破壳机的正交试验研究     

程国梁  郑甲红  卢军党  王亚妮  王超 《现代农业科技》2021,19(19)

为了优化自主设计的六点挤压式核桃破壳机的最佳参数,选择含水率,挤压行程,破壳速度三个因素做正交实验,最终由试验结果可得,六点挤压式核桃破壳机的破壳最优条件是核桃的挤压行程9mm,含水率20%,破壳速率1s/个,且经过试验验证得出最佳破壳综合指标在0.972左右。  相似文献   

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  

浦心春  韩建国 《草地学报》1994,2(1):30-35

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   

Phenylalanine ammonia lyase activity in chilli CM-334 infected by Phytophthora capsici and Nacobbus aberrans     

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   

CPPU对猕猴桃种子发芽的影响     

李从玉  张扬 《安徽农业科学》2010,38(4):1802-1803

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   

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   

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  

于海滨  张显国 《东北林业大学学报》1994,22(2):46-51

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   

烤烟生产打叶组合配方计算机辅助系统构架研究     

刘冬梅  卢艳萍  张薇  张家征  王云川  包开荣 《农业网络信息》2007,(11):36-38

本文分析了当前烤烟生产与打叶复烤之间存在的主要问题,从烟叶的生产、收购、仓储、品质及叶组配方等5个方面进行构架建设,提出一个以烟叶主要化学成分作为品质依据进行打叶复烤组合配方的计算机辅助系统解决方案.  相似文献