不同干旱强度对糜子产量的影响及其在估产中的应用     

徐学选  陈国良  穆兴民 《水土保持通报》1994,14(6):41-47

该利用盆栽试验结果，通过分析糜子在不同生育阶段受不同强度干旱的产量反应，得出：糜子各生育期的受旱缺水指数Ｒｉ减产指数Ｒｉ，及产量反应系数Ｋｙｉ。认为糜子在灌浆期对干旱敏感性最强，此阶段受旱，日减产率量大，水分生产力最低，灌水效果最佳。拔节＋扬花期产量和干旱之间的反应最弱。糜子生育期耗水分蘖期最多，占总量的２８．６％，正常供水盆栽全生育期耗水１８５ｍｍ，不同干旱度下为１６７ｍｍ．水分生产力平均为０  相似文献   

叶蛋白专用打浆机的研究   总被引：2，自引：0，他引：2  

王昌志  王丽梅  罗翠兰  伍乾坤  邓志锋 《农业工程学报》1996,12(2):158-161

从提取叶蛋白专用打浆机的特殊要求出发，提出叶蛋白专用打浆机的工作原理，研制了９ＤＹ－５０型叶蛋白专用打浆机，通过试验分析得出了生产率与功耗的计算公式  相似文献   

THE PRIMITIVE STUDY ON THE RELATIONSHIP BETWEEN ARTIFICIAL SCOTCH PINE PRODUCTIVITY AND ITS DENSITY IN WESTERN PART OF HEILONGJIANG     

苑增武  李桂生  宋国育 《林业研究》1994,5(4):6-12

INTRODUCTIONInwesternpartofHei1ongiiangprov-ince,scotchpine(Pinussylvestris)iswindbreak,sand-fixationandcommercialforest.It'soneofthemaintreesinthecon-structionof"threeNorth"shelterforest.ThewoodcharacterisexceI1ent.Sothedis-cussionandvaluationonScotchPineproductivityhasimportantmeaningoncommerce,windbreakandsand-fixation.Theanalysisofvolumegrowth,bio-productivityandre1ationshipsbe-tweenvo1umegrowthanddensityandbe-tweenbio-productivityanddensity,gaveevidencetostudyfastgrowingscotchpine…  相似文献   

长江上游商品竹成本、价值和价格问题探讨     

杜锦田  吴南云 《竹子研究汇刊》1987,(2)

长江上游地区土地资源丰富,气候条件良好,市场潜力巨大,并且当地群众有栽培、采伐、加工利用竹子的丰富经验,因此,在这一地区发展商品竹生产,对促进该地区的经济发展有重要意义。然而长期以来,竹子产量不能满足生产需要,供需矛盾突出。为了改变这一状况,除了依靠科学技术提高生产力外,还应该利用经济杠杆的作用,在短期内使商品竹生产有较大发展。本文分析了该地区商品竹的成本、价值和价格,指出了商品竹生产中存在的问题及解决办法。  相似文献   

柱花草刈割次数与生产性能的关系   总被引：4，自引：1，他引：3  

丁迪云  张庆智 《草业科学》1993,10(1):63-64,67

对格拉姆柱花草的刈割次数与生产性能关系进行了两年时间的研究,结果表明:不同年度、不同次数刈割对生产性能影响很大,当年刈割一次比刈割两次产草量增长44%—68%,粗蛋白产量增长40%左右;第二年刈割两次比刈割一次产草量增长4.8%,粗蛋白产量增长52%,而比刈割三次产草量增长17%,粗蛋白产量增长9%。  相似文献   

4种蛋白质饲料对幼龄獭兔饲用价值的比较研究   总被引：1，自引：0，他引：1  

李清宏  王晓丹  高瑞斌 《华北农学报》2012,(1):223-229

为了评定豆粕、玉米蛋白粉、棉粕、菜粕等4种蛋白质饲料在獭兔幼龄阶段的营养价值,试验以3月龄獭兔为研究对象,通过化学测定、消化试验与饲养试验,比较分析了4种蛋白质饲料的化学组成及其营养价值。结果显示:粗蛋白表观可吸收量以棉粕最高,为383.22 g/kg,分别比豆粕、玉米蛋白粉、菜粕多3.4,137.9,20.85 g/kg;必需氨基酸化学值指数(EAAI)与可吸收量指数均以菜粕最高,分别为1.18,0.047 5;干物质表观消化能以豆粕最高,为9.99 MJ/kg,分别比玉米蛋白粉、棉粕、菜粕高2.94,3.20,2.68 MJ/kg;豆粕的钙消化吸收最佳,消化率与表观吸收量分别为79.32%,18.59 g/kg,极显著高于棉粕,显著高于菜粕;玉米蛋白粉的磷消化吸收最佳,消化率与表观吸收量分别为63.82%,6.14 g/kg,极显著高于棉粕,显著高于菜粕;4个处理的日均增重、日均采食量、料重比均无显著差异,以棉粕组日均增重最大,为26.64 g。棉粕可用作3月龄獭兔的蛋白质饲料。  相似文献   

Comparison of Assimilation Rates in Leaves at Various Nodes in Canopies of Three Spring Wheat Cultivars with Different Plant Forms     

《Plant Production Science》2013,16(3):174-178

Abstract

This study was conducted to reveal the ideotype of wheat (Triticum aestivum L.) canopy structure for high yield and biornass productivity. The assimilation rate and nitrogen contents of the flag, second, third and lower leaves and the ear of the main stem were measured in three spring cultivars with different plant forms (figures), Haruyutaka, Norin 61 and Selpek, under field conditions. The assimilation rate was evaluated based on the amount of water-soluble carbohydrate accumulated during the day (WSC/day). Surface area indexes of the ear and flag leaf in Haruyutaka and Selpek were larger than those in Norin 61. In Haruyutaka and Selpek, the amount of WSC/day was larger in the flag leaf than in the second or third leaf, which had a sufficiently high nitrogen content. On the contrary, in Norin 61, the amount of WSC/day in the flag leaf was similar to that in the second and third leaves during the grain-filling period. The amount of WSC/day in the flag leaf during the last half of the grain-filling period was much higher in Selpek than in Haruyutaka and Norin 61. This may be one of the reasons why Selpek had a heavier total dry weight than Haruyutaka and Norin 61 in 1993 and 1995.  相似文献   

Review of human-animal interactions and their impact on animal productivity and welfare     

Idrus Zulkifli 《畜牧与生物技术杂志(英文版)》2013,4(1):25

Humans and animals are in regular and at times close contact in modern intensive farming systems. The quality of human-animal interactions can have a profound impact on the productivity and welfare of farm animals. Interactions by humans may be neutral, positive or negative in nature. Regular pleasant contact with humans may result in desirable alterations in the physiology, behaviour, health and productivity of farm animals. On the contrary, animals that were subjected to aversive human contact were highly fearful of humans and their growth and reproductive performance could be compromised. Farm animals are particularly sensitive to human stimulation that occurs early in life, while many systems of the animals are still developing. This may have long-lasting impact and could possibly modify their genetic potential. The question as to how human contact can have a positive impact on responses to stressors, and productivity is not well understood. Recent work in our laboratory suggested that pleasant human contact may alter ability to tolerate various stressors through enhanced heat shock protein (hsp) 70 expression. The induction of hsp is often associated with increased tolerance to environmental stressors and disease resistance in animals. The attitude and consequent behaviour of stockpeople affect the animals’ fear of human which eventually influence animals’ productivity and welfare. Other than attitude and behaviour, technical skills, knowledge, job motivation, commitment and job satisfaction are prerequisites for high job performance.  相似文献   

Effect of a transitory controlled nursing on days 9–11 or a 24-h fast on the production of free-nursing rabbits     

Cs. Eiben  K. Gódor-Surmann  K. Kustos 《Livestock Science》2013,155(1):148-156

Altered nursing or nutrition before artificial insemination (AI) can be used as a doe biostimulant to improve lactating rabbits reproduction. The timing of a shift from free to a 3-day controlled nursing to AI or the nursing method at fast-refeeding can affect the efficacy of these stimulations. In an earlier study the effects of a 3-day controlled nursing on days 8, 9 and 10 or in controlled nursing rabbits, the impact of a 24-h fast with 48–50 h re-feeding were investigated. This follow-up work tested a 3-day biostimulation with controlled nursing on days 9, 10 and 11. Another aim was to assess the same doe fast-refeeding but now in free-nursing rabbits. Pannon White does (n=480) were artificially inseminated 11 days post-partum. Control (C) does nursed freely. Rabbits simulating local farm practice (F) had controlled nursing until day 14 using a metal-plate as separation and then free nursing to weaning (day 35). In biostimulations with altered nursing, there was a shift from free to a 3-day controlled nursing (days 9–11) with a wire-mesh separation (BW), a metal-plate insertion (BM) or nest-tray removal (BN) and return to free nursing on day 12 until weaning. The C, F, BW, BM and BN does were fed ad libitum. At biostimulation with fast-refeeding (BF), the free-nursing does were subjected to a 24 h water-only fast between days 8 and 9 and a 48–50 h ad libitum re-feeding before AI. Doe reproduction and growth of the current litter were differently affected by the treatments. In the C, F, BW, BM, BN and BF does, sexual receptivity was 83, 90, 68, 80, 74 and 85% (P=0.05), the kindling rate was 79, 76, 74, 89, 68, 70% (P=0.05), the number of kits born alive was 7.9, 8.0, 8.8, 9.1, 7.9, 6.8 (P=0.005), kit weight at weaning 982, 991, 953, 986, 955, 964 g (P=0.012) and at 70 days of age 2383, 2407, 2220, 2350, 2279, 2382 g, respectively (P=0.001). Among biostimulations with altered nursing, the 3-day controlled nursing with a metal-plate separation (BM) can be advised for the practice because only this method was efficient in this (days 9–11) and previous (days 8–10) studies. There appears to be an interaction between doe nursing and feeding, since the same fast led to different production of free-nursing does compared to those in a previous work that nursed controlled.  相似文献   

Assessing the effects of site factors on the productivity of a feller buncher:a time and motion analysis     

Ebru Bilici  Abdullah E.Akay  Dalia Abbas 《林业研究》2019,(4):1471-1478

We evaluated,for the first time in Turkey,the productivity of a feller buncher during clear-cut operations of two Brutian pine stands located in Canakkale,northwestern Turkey with different diameter classes and terrain conditions.In the first stand with 24.6 cm average DBH,the feller buncher cut full trees and moved them to roadside.In the second stand with 34.3 cm average DBH,the feller buncher cut trees in two stages due to their larger diameters and the relatively steep and rough terrain conditions of the site.The effects of specific stand features,DBH and tree height measurements were assessed through statistical analysis in relation to productivity.The results indicate that the average productivity for the first stand was about 118 m^3h^-1,while it was about 80 m3h-1 in the second stand.Even though tree diameter and volume were higher in the second stand,productivity decreased by32.3%due to extra time spent on the two-stage cutting operation.The results revealed that harvesting operations should be planned carefully and the right equipment selected by accounting for different tree sizes,terrain conditions and machine specifications in order to better understand their effects on production.  相似文献