Response of pea (Pisum sativum L.) to mepiquat chloride under varying application doses and stages     

E. Elkoca  F. Kantar 《Journal of Agronomy and Crop Science》2006,192(2):102-110

Grown as a monoculture, peas (Pisum sativum L.) exhibit severe lodging after flowering and lodging causes yield reductions considerable. This study was conducted to investigate the effects of dose (untreated, 25, 50, 75 and 100 g a.i. ha^?1) and stage (late vegetative, early blooming and early pod filling) of mepiquat chloride (MC) application on the growth, lodging control, seed yield and yield parameters of pea (Pisum sativum L.) under field conditions in Erzurum, Turkey in 2002 and 2003. Application doses of 25, 50, 75 and 100 g a.i. ha^?1 significantly reduced stem height by 5.3 %, 7.2 %, 7.5 % and 6.4 % and increased stem width by 7.5 %, 12.7 %, 12.3 % and 15.7 % respectively, when compared with the untreated control, and thereby reduced the tendency of the crop to lodging. Increases of the seed yield under different application doses of MC ranged between 13.7 % and 20.1 % over the untreated control. However, in all parameters investigated, except for stem width, higher application doses of MC gave no clear advantages compared with the application dose of 25 g a.i. ha^?1. Seed yield was also significantly influenced by application stage of MC and application at early blooming stage of crop, MC significantly increased seed yield by 11.4 % and 10.2 % when compared with the late vegetative and the early pod filling stages respectively. Furthermore, the interaction of application dose and stage was significant, and spraying of pea plants with 25 g a.i. ha^?1 MC at early blooming stage has the most beneficial effects on the characters evaluated.  相似文献   

Synthesis of High Yield Lactide     

《保鲜与加工》2003,(11):41

  相似文献   

液体生态地膜不同用量对小米草生长及产量的影响   总被引：7，自引：0，他引：7  

王建红  李英法  陶晓东 《草原与草坪》2003,(2):47-48

小米草播种后,用液体生态地膜不同用量喷施畦面。结果表明,喷施液体生态地膜能增加小米草的基本苗数量,提高秧苗素质,并显著增加小米草的鲜草产量;液体生态地膜在小米草播量为600～750kg/hm2。这为液体生态地膜在牧草栽培上的应用提供了参考依据。  相似文献   

黄麻圆果种新品种中黄麻1号的选育研究   总被引：3，自引：1，他引：2  

龚友才 黎宇戴志刚  李德芳粟建光 陈安国 《中国麻业》2005,27(4):170-175

中黄麻-号（原名C90-2）系1984年利用黄麻优良新品系71-8和79-51进行有性杂交，再与79-51两次回交，采用系统选择与定向选择相结合的方法，经六代选择于1990年育成的黄麻新品种。该品种有植株高大、高抗炭疽病、丰产稳产性好、适应性广等特征，适宜在全国各主要麻区推广种植。在1993-1994年品系比较试验中，两年平均纤维产量2814．00kg／hm^2，比对照增产14．32％，差异极显著；2002-2003年全国黄麻多点区域试验，纤维产量2808．00kg／hm^2，比对照品种粤圆五号（2472.15kg／hm^2）增产13．59％，增产极显著；纤维品质优良，纤维支数439支，纤维强力401牛顿／克，优于对照品种。  相似文献   

基于神经网络的电力系统谐波测量方法研究     

张一斌王小华  何怡刚 《湖南农业大学学报(自然科学版)》2005,32(6)

提出了一种新的基于三角基函数神经网络的电力系统谐波测量方法，给出了该神经网络算法的收敛定理，并采用加窗插值算法修正基波频率的准确度．该方法不需要同步采样和整周期截断，可一次性获得电力系统基波及各次谐波的频率、幅值和相位．计算机仿真结果表明，该方法计算精度高，计算量小，收敛速度快．  相似文献   

Effect of Weather and Soil Conditions on Yield Components and Bread-Making Quality of Winter Wheat (Triticum aestivum L.) and Winter Triticale (Triticosecale Wittm.) Varieties in North-East Germany     

O. Erekul  W. Köhn 《Journal of Agronomy and Crop Science》2006,192(6):452-464

The reduced nutrient and water availability of the sorption‐weak silty sand soil in Thyrow when compared with the loamy sand soil in Berge enhanced the negative effects of unfavourable weather conditions. Winter wheat reacted to weather conditions and soil quality substantially more sensitively than winter triticale, so that the cultivation of wheat on very light sandy soil is combined with a higher risk. Reduced yields resulting from site differences are, for both cereals, mainly a result of reduced ear densities. Low grain yields as in the dry year 2003 led to high crude protein contents, this being more pronounced for winter wheat than for triticale and on the poor silty sand soil in Thyrow to a greater degree than on the loamy sand soil in Berge. For the starch content the contrary holds true. Grain yields were, to a greater extent, decisive for the protein and starch yields than the content values. For both cereals, the sedimentation value, the wet gluten value, the gluten index and the falling number resulted in principally higher values in the dry year 2003 and on the loamy sand soil when compared with the wet year 2004 and the silty sand soil. Only the wet gluten content was not clearly influenced by soil quality. All parameters describing bread‐making quality are clearly lower for winter triticale than for winter wheat. Especially, the falling number was not satisfactory, so that the tested triticale varieties seem only to be suitable for bread‐making by mixing with wheat flour. The internal grain quality of winter wheat varieties is extensively genetically determined. Weather and soil‐induced variations in the quality parameters were, with only few exceptions, greater for winter wheat than for triticale.  相似文献   

Irrigation and Nutrient Effects on Growth and Water–Yield Relationship of Wheat (Triticum aestivum L.) in Central India     

K. G. Mandal  K. M. Hati  A. K. Misra  K. K. Bandyopadhyay  M. Mohanty 《Journal of Agronomy and Crop Science》2005,191(6):416-425

Increasing production of wheat from a limited water supply can result from efficient irrigation and nutrient management. A 3‐year field experiment was conducted at the Indian Institute of Soil Science, Bhopal, to study the growth, yield, seasonal evapotranspiration (ET) and water use efficiency (WUE), and the water–yield relationship of wheat in a soybean–wheat cropping system on vertisols. Three levels of irrigation, viz. I₀, no post‐sowing irrigation; I₁, two irrigations [crown root initiation (CRI) and flowering stage]; and I₂, three irrigations (CRI, maximum tillering and flowering stage) and three nutrient management treatments, viz. F₀, control (without fertilizer/manure); F₁, 100 % NPK (100–21.5–24.9 kg ha^?1); and F₂, 100 % NPK + farmyard manure (FYM‐10 t ha^?1) were tested in a split‐plot design with three replication. It has been established (through anova ) that the year effect was rather negligible and the interaction effects of irrigation and nutrient management on the growth parameters, ET, yield components, yield and WUE were significant. Plant height, progressive leaf area index, dry matter accumulation and crop growth rate were higher in I₂F₂, and I₂F₁ and I₁F₂ were statistically at par. The seasonal ET increased significantly with the increase in water supply in every nutrient treatment and it was highest in I₂F₂ and lowest in I₀F₀. The highest grain yield was obtained in I₂F₂; and a similar yield was recorded in I₃F₁ and I₂F₂. This shows a strong interaction effect between irrigation and nutrients. Yield components, viz. number of ears m^?2, number of grains ear^?1 and 1000‐grain weight were significant. The higher number of ears m^?2 containing greater number of grains with relatively heavier weights appeared to have contributed to the higher yield in I₁F₂, I₂F₁ and I₂F₂. The highest WUE obtained in I₀F₂ did not correspond to the highest yield and maximum ET, but a WUE of 10.43 kg ha^?1 mm^?1 in the I₂F₂ combination corresponded with the highest yield and the seasonal ET requirement was 391.8, which was 137 % greater than the water use at maximum WUE. The ET–grain yield relationship was linear, with a lowest regression slope (i.e. marginal WUE) and elasticity of water production (E_wp) in F₀ and a considerably higher slope and E_wp in F₁ and F₂. As the E_wp is positive and close to one in 100 % NPK treatment, the scope of improving WUE and yield with only inorganic fertilizer is very little, and relatively greater scope exists in the integrated management of organic manure and inorganic fertilizer. The results suggest that integrated nutrient management (100 % NPK + FYM) in conjunction with three irrigations maximized yield of wheat with concomitant improvement in ET and WUE under limited water availability.  相似文献   

水稻栽培因素对北方粳稻产量及米质的影响[Ⅵ]--穗肥追肥时间对产量及米质的影响     

严光彬  李彦利  孟令军  王万成  贾玉敏  严永峰 《北方水稻》2005,(3):20-21

通过田间对比试验研究穗肥追施时间对水稻产量及米质的影响,结果表明,水稻的穗肥追施时间越晚,加工品质越好,而产量和食味品质明显降低.这种趋势以出穗前25 d为准,有跳跃式的质的变化.所以为了提高产量和增加食味品质,水稻的穗肥追肥时间不应晚于出穗前25 d.  相似文献   

影响护栏防护性能的相关因素研究     

黄红武莫劲翔  杨济匡钟志华 《湖南农业大学学报(自然科学版)》2004,31(2)

采用计算机仿真的手段，运用有限元仿真软件LS-DYNA建立了圆柱形立柱形式的波形梁护栏的有限元模型，护栏的材料采用的是钢材，护栏板与立柱之间通过螺栓连接，基于这个模型，本文对轿车与护栏碰撞过程中影响护栏防护性能的摩擦系数以及护栏板与立柱之间的连接性能进行了研究，结果发现，通过减小摩擦力以及改变护栏板与立柱之间螺栓连接的临界失效载荷，可以提高事故中护栏对乘员的保护能力。  相似文献   

王草和象草在云南省亚热带地区的适应性研究   总被引：17，自引：1，他引：16  

钟声  周自玮  文际坤  杨世平 《草业科学》2002,19(5):23-25

对王草和象草在云南省亚热带地区的适应性研究结果表明，两者在产量和养分的季节变化动态上有一定差异，在早期生长速度，再生性，年总产量和抗寒性等方面差异较小，多次刈割利用时，两者均表现出再生性好，饲草产量高的特点，其鲜草，干物质和粗蛋白的年总产，象草平均为298t/hm^2,53.7t/hm^2和4．18t/hm^2，王草为276t/hm^2,58.2t/hm^2和4．30t/hm^2，种植利用时两者可相互替代。  相似文献