虚拟现实与果树修剪   总被引：4，自引：1，他引：3  

郑彦妍  周国民 《农业网络信息》2004,(8):10-12

虚拟现实是近年来发展迅速、引人关注的研究热点。本文提出了虚拟现实在农业领域——果树修剪技术推广中应用的可能性。简述了虚拟现实的基本概念和应用现状，并就“虚拟果树修剪系统”提出了初步设想和基本思路。  相似文献   

修剪方式对广玉兰大树移植成活率及生长的影响     

罗贵斌  张建军 《西北农业学报》2016,25(6):875-881

为提高大树移植成活率及探索修剪方式与大树移植成活生长的关系,以20a以上生广玉兰为试材,以全冠移植为对照(CK),分别采用剪去1/3枝叶量的轻度修剪(QX)、剪去2/3枝叶量的中度修剪(ZX)和不留枝叶的截干回缩修剪(JX)3种方式修剪后移植,经过3a连续试验观察,研究不同修剪方式对广玉兰大树移植成活率和生长的影响。结果表明,与CK相比,3种修剪方式极显著提高广玉兰移植后的成活率和新生叶片数、第2年(2013年)和第3年(2014年)的侧梢数、侧梢长度和底径以及第1年(2012年)和第3年(2014年)冠幅生长;与其他2种修剪方式相比,JX显著提高广玉兰移植成活率、第2年(2013年)和第3年(2014年)的侧梢数、顶梢长度、侧梢长度及冠幅生长以及第3年(2014年)的新生叶片数;显著提高第2年(2013年)和第3年(2014年)的侧梢底径。表明截干回缩修剪更有利于广玉兰大树移植的成活和复壮生长。  相似文献   

单株幼龄苹果树修剪仿真研究     

杨丽丽  陈甲风  谢锐  华净  康孟珍  董乔雪 《农业机械学报》2015,46(S1):41-44

修剪是果树生产中重要的技术手段,要想研究更加合理的修剪技术体系,就必须保证能够对修剪反应有准确、直观和及时的判断,而仿真模拟技术提供了这种可能。以幼龄苹果树为研究对象,采用不同修剪处理对比的方法,在田间试验的基础上,总结修剪反应规律,构建苹果树结构和修剪模型。在此基础上基于Qt框架和OpenGL图形库,开发了单株苹果树修剪仿真软件平台。结合优化算法,通过仿真平台模拟了给定生产目标的修剪方案优化,优化结果对虚拟学习和实际生产提供了可视化指导。  相似文献   

不同修剪时期对杜鹃花花期的影响     

张艳红 《北方园艺》2007,(3):118-119

以开花时间不同的杜鹃花为试材，研究了不同时期修剪对杜鹃花生长和开花的影响。试验结果表明：修剪可以使早、中花型的杜鹃花花期短期延后，对晚花型的杜鹃花影响甚微。修剪过早，株型不整齐；过晚影响开花的数量和质量。  相似文献   

Prediction of irrigation return flows through a hierarchical modeling approach   总被引：1，自引：0，他引：1  

S. Mohan  D.P. Vijayalakshmi 《Agricultural Water Management》2009,96(2):233-246

The quantity of water available for irrigation is getting scarce in many countries and it assumes great importance for assured crop production, especially in view of the erratic behavior of the monsoon. Thus, there is a pressing need to improve the water efficiency of irrigation systems. One-way of improving the efficiency of the irrigation system is reusing the return flow from the irrigation system. This task requires quantification of return flow, which still remains as a grey area in irrigation water management. The estimation of return flow from the irrigation system is usually obtained using thumb rules depending upon the site-specific conditions like command area conditions and soil properties. In this paper, a hierarchical modeling technique, namely, regression tree is developed for return flow estimation. Regression tree is built through binary recursive partitioning. The effective rainfall, inflow, consumptive water demand, and percolation loss are taken as predictor variables and return flow is treated as the target variable. The applicability of the hierarchical model is demonstrated through a case study of Periyar-Vaigai Irrigation System in Tamil Nadu, India. The model performance shows a good match between the simulated and the field measured return flow values. Results of statistical analysis indicated that the correlation coefficients are high for both single as well as double crop seasons.  相似文献   

修剪强度对早实核桃萌芽率和成枝力的影响   总被引：4，自引：0，他引：4  

吴开志  肖千文  唐礼贵  庞永长  周兰英 《北方园艺》2007,(4)

通过对早实核桃轻剪、中剪、重剪和长放几种修剪方法的研究,探讨了不同修剪强度对成枝长度、枝条粗度、萌芽率、成枝力的影响。结果表明:轻剪、中剪、重剪比长放的成枝长度增加3.60～40.52cm,粗度增加0.19～0.69cm;长放的成枝萌芽率提高了0.15%～0.25%,成枝力提高了0.11%～0.22%。  相似文献   

Nitrogen-fixation dynamics in a cut-and-carry silvopastoral system in the subhumid conditions of Guadeloupe, French Antilles     

M. Dulormne  J. Sierra  P. Nygren  P. Cruz 《Agroforestry Systems》2003,59(2):121-129

This paper summarizes several studies on N recycling in a tropical silvopastoral system for assessing the ability of the system to increase soil fertility and insure sustainability. We analyzed the N₂ fixation pattern of the woody legume component (Gliricidia sepium), estimated the recycling rate of the fixed N in the soil, and measured N outputs in tree pruning and cut grass (Dichanthium aristatum). With this information, we estimated the N balance of the silvopastoral system at the plot scale. The studies were conducted in an 11-year-old silvopastoral plot established by planting G. sepium cuttings at 0.3 m × 2 m spacing in natural grassland. The plot was managed as a cut-and-carry system where all the tree pruning residues (every 2-4 months) and cut grass (every 40-50 days) were removed and animals were excluded. No N fertilizer was applied. Dinitrogen fixation, as estimated by the ¹⁵N natural abundance method, ranged from 60-90% of the total N in aboveground tree biomass depending on season. On average, 76% of the N exports from the plot in tree pruning (194 kg [N] ha^–1 yr^–1) originated from N₂ fixation. Grass production averaged 13 Mg ha^–1 yr^–1 and N export in cut grass was 195 kg [N] ha^–1 yr^–1. The total N fixed by G. sepium, as estimated from the tree and grass N exports and the increase in soil N content, was about 555 kg [N] ha^–1 yr^–1. Carbon sequestration averaged 1.9 Mg [C] ha^–1 yr^–1 and soil organic N in the 0-0.2 m layer increased at a rate of 166 kg [N] ha^–1 yr^–1, corresponding to 30% of N₂ fixation by the tree. Nitrogen released in nodule turnover (10 kg [N] ha^–1 yr^–1) and litter decomposition (40 kg [N] ha^–1 yr^–1) contributed slightly to this increase, and most of the recycled N came from the turnover or the activity of other below-ground tree biomass than nodules. This revised version was published online in June 2006 with corrections to the Cover Date.  相似文献   

大叶紫薇的修剪技术   总被引：1，自引：0，他引：1  

黎可华  梁锦钧 《广东园林》2007,29(6):48-49

简要介绍了大叶紫薇的形态特征,观赏特点,开花习性与营养生长、品种、光照、修剪的关系,着重从修剪时间、修剪强度及修剪方法等方面提出相应的修剪技术要点,提高大叶紫薇的观赏价值.  相似文献   

修枝对樟子松人工林生长的影晌     

刘延文 《安徽农学通报》2014,(5):101-102

以塞罕坝机械林场境内的25a生樟子松人工林为研究对象,用标准地调查法对其进行每木检尺,并进行分析比较。结果表明,人工修枝可以促进樟子松人工林胸径的生长,但不影响其树高的生长。  相似文献   

道路绿化树木修剪及剩余物制片联合机的研究与分析     

尼姝丽  薛国磊  王述洋  高宇博  赵利铭 《安徽农业科学》2014,(2):501-502,510

通过对国内外树木修剪机械及修剪后的剩余物处理现状研究,提出一种道路绿化树木修剪及剩余物制片联合机,并对其经济效益进行了分析。该机实现了路旁树木的修剪及剩余物现场处理。  相似文献