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1.
M. Özgen 《Journal of Agronomy and Crop Science》1991,166(5):318-325
The purpose of this study was to compare responsiveness to environment as well as the stability of newly developed promising lines with traditional commercial cultivars. Subject research was conducted in Ankara between 1983-1989 on common and durum wheat cultivars and lines. Regression coefficient (b) was used as the criterion of genotypes' responsiveness to environment whereas deviation from regression (S2 d) and coefficient of determination (r2 ) were used as stability parameters. Each experiment year was regarded as an environment and yield average of each year was used as the environmental index.
In consequence of the research, it was determined that new varieties with high yield, adaptable to diverse environments could be developed by means of hybridizations between parents having different genetic characteristics which were provided from diverse ecological regions. 相似文献
In consequence of the research, it was determined that new varieties with high yield, adaptable to diverse environments could be developed by means of hybridizations between parents having different genetic characteristics which were provided from diverse ecological regions. 相似文献
2.
Two mungbean varieties, Guj-1 and PIMS-1 differing in their productivity potential, were examined to investigate their photosynthetic system at various stages of growth in relation to yield with two different dates of sowing. Vertical leaves were found to be beneficial. On the other hand, excessive leaf area during the later stages of growth may be detrimental to yield. Lower LAD at seedling stage and overall high NAR values may be reflected in higher grain yield. NAR declined as season progressed and this, in turn, may be related with increase in LAI. The grain yield was considerably more at the first date of sowing as compared to second date of sowing, the effect was being more pronounced in var. PIMS-1 . Various environmental factors recorded at two different dates of sowing and at various stages of growth indicated that these factors may have influenced the yield potential at two different dates of sowing. 相似文献
3.
《Livestock Production Science》2005,95(3):255-263
The aim of the experiment was to investigate the effects of cage floor and cage density on stress parameters of laying hens. A total of 162 brown laying hens (Hyline Brown), aged 34 weeks, were used in the experiment. Compact-type battery cages, with three floors, were used. Hens were allocated as one, three or five hens in each of 18 cages to obtain three different cage density groups of 1968, 656 and 393.8 cm2 floor area per hen, respectively. The same number of cages with different cage density were allocated to three different battery floors (first floor=top, second=middle, third=bottom) systematically. Values for body weight, mortality rate, egg weight, egg production, egg quality characteristics, egg yolk cholesterol content, the levels of blood plasma corticosterone, serum glucose, total cholesterol and triglycerides, the ratio of heterophils to lymphocytes (H-L ratio), antibody titers, claw length score, foot health score, plumage score and throat skin injuries were taken as indicators of stress. The values for egg weight (P<0.01) at the first floor were greater than the other floor levels. The group with five hens per cage had significantly lower mean estimates (P<0.01) than other groups with respects to body weight (P<0.001), egg production (P<0.001), egg weight (P<0.001) and plumage score (P<0.01), while significantly higher mean estimates for egg albumen index (P<0.01), Haugh unit (P<0.01), serum glucose (P<0.001), and H-L ratio (P<0.001). Serum cholesterol was higher in cages with one hen than that with five hens, whereas plasma corticosterone was lower. Antibody titers in cages with one hen was similar to that with three or five hens; however, those with three hens had higher titers than those with five hens. Values for egg breaking strength, yolk index, egg cholesterol content, and foot health score were not affected by cage density or floor. The results suggest that the allocation of three hens per cage had no measurable effect on health and welfare. 相似文献
4.
隐性白羽肉鸡及其配套地方鸡部分血液生化指标的测定 总被引:1,自引:1,他引:1
本试验测定了我校最新育成的隐性白羽肉鸡快慢羽系父系、母系及其配套地方鸡广西黄鸡和文昌鸡主要的血液生化指标。结果表明,四个品系血清总蛋白、白蛋白、葡萄糖、胆固醇、Ca含量接近,血清P、K、Na含量A系最高,显著(P<0.05)或极显著(P<0.01)高于其它三系,各品系内公母之间母鸡的血Ca均极显著(P<0.01)高于公鸡。血清淀粉酶(AMY)活力和肌酸磷酸激酶(CK)活力B系极显著(P<0.01)高于其它三系,血清碱性磷酸酶(AKP)活力品系间差异不显著(P>0.05)。 相似文献
5.
An experiment was conducted to scientifically identify the appropriate feed for Gansu Alpine Fine Wool ewes in order to change the animals' breeding mode, which currently can only be mated at the age of 2.5 years due to insufficient nutritional supply. The experiment selected 48 12-month-old ewes and randomly divided them into group a (Diet 1), group b (Diet 2), group c (Diet 3), and a control group with no supplementary feeding. The feed test was run for 90 days. The rumen pH of groups a and b were very significantly higher (P<0.01) or group c significantly lower (P<0.05) than control group. The rumen ammonia nitrogen, protein nitrogen and total nitrogen of groups a, b and c were all higher than control group (P<0.01). The total volatile fatty acids of group a and b were all higher than the control group (P<0.01), group b significantly higher than group c (P<0.05). The molar ratio of acetic acid and propionic acid in group a was very significantly higher than control group (P<0.01), group b and c were significantly higher than control group (P<0.05). The molar ratio of butyric acid in group a was very significantly higher than group c (P<0.01). The ratio of acetic acid and propionic acid in group b was significantly lower than control group (P<0.05). The number of several rumen fiber-degrading bacteria and protozoa in groups a, b and c were very significantly (P<0.01) or significantly (P<0.05) higher than the control. In conclusion, this study shows that supplementary feeding can positively affect the rumen metabolic parameters and the number of several rumen microorganisms in Gansu Alpine Fine Wool ewes. In general, the effects of Diet 1 were the strongest, while Diet 2 also produced notable improvements. © 2018, Editorial Office of Acta Prataculturae Sinica. All rights reserved. 相似文献
6.
【目的】新疆有着全中国最大面积的盐碱地和加工番茄的种植基地。在新疆开展两年试验以研究加工番茄在氮盐交互下生长、生理、产量和品质的变化规律,获得适宜新疆盐碱地种植加工番茄的合理施氮量和土壤盐分范围,为新疆扩大加工番茄种植面积和合理施氮提供科学的理论依据及技术途径。【方法】试验于2017和2018年在石河子大学现代节水灌溉兵团重点实验基地进行,以当地主栽品种3166为试验材料,2017年试验共设置4个土壤含盐量水平:1.5、4.0、7.0和10.0 g·kg-1及4个氮素水平:201、166、131和96 kg·hm-2,2018年在2017年的基础上去除10.0 g·kg-1的土壤含盐量,增加5.0 g·kg-1的土壤含盐量和不施氮量处理。试验测定和分析加工番茄的荧光叶绿素参数、产量和品质指标。【结果】在氮盐交互下,加工番茄荧光参数及产量等指标均呈现出复杂的变化规律。绝大多数的荧光参数及产量受土壤盐分的主导作用较氮素强,在同等氮素水平下,7.0 g·kg-1和10.0g·kg 相似文献
7.
覆盖栽培模式对冬小麦花后旗叶 光合特性及产量的影响 总被引:2,自引:0,他引:2
为探究旱地小麦秸秆带状覆盖栽培增产的光合特性和干物质积累转运的特征,在甘肃省半干旱雨养农业区以“陇中2号”为材料,研究了秸秆带状覆盖栽培(BS)、地膜覆盖栽培 (PF)和无覆盖露地栽培(CK)3种栽培模式下冬小麦花后旗叶光合特征、叶绿素荧光动力参数、干物质积累转运及产量的差异。结果表明:与CK相比,BS和PF显著提高了花后旗叶光合势、叶绿素和类胡萝卜素含量及叶绿素/类胡萝卜素比率,且BS在生育后期优于PF。BS整个生育期的净光合速率、气孔导度均高于CK,而PF仅生育前期发挥正效应,生育中、后期出现了负效应。BS生育前中期胞间CO2浓度、生育中后期旗叶瞬时水分利用效率均高于PF和CK,前者分别高出2.8%~8.2%和6.7%~11.3%,后者分别高出30.3%~44.8%和27.5%~39.3%。PF在灌浆中期以前,BS在整个花后生育期显著提高了小麦花后旗叶Fv/Fm、F′v/F′m、ΦPSⅡ、qP、ETR,降低了NPQ。BS较PF和CK显著提高了花后干物质输入籽粒量和对籽粒粒重的贡献率,2个指标分别增加2.6%、1.0%和14.2%、8.6%。BS显著增加了单位面积穗数,提高了产量,较CK增产35.4%。说明秸秆带状覆盖能显著改善旱地冬小麦花后光合效率,促进干物质积累转运,从而达到增产的效果。 相似文献
8.
9.
梨树在自然水分亏缺下的生理反应 总被引:11,自引:0,他引:11
1994~1996年对梨树在自然水分亏缺和水分充足条件下的主要水分生理参数、气孔相对开张度(RSOD)、蒸腾速率(Tr)和光合速率(Pn)进行了比较研究。结果表明,梨树属于低水势耐旱类型,在自然水分亏缺下,其叶水势(ψw)显著降低,膨压(ψp)明显增高,而RSOD、Tr和Pn则无显著变化。梨树具有明显的渗透调节和一定的弹性调节作用,在中度水分亏缺下,其渗透调节能力△π100或△π0分别为0.44MPa和0.77MPa,弹性调节能力△|β|和△εmax分别为2.78和3.19。另外,在自然水分亏缺下,梨树叶片还具有较强的保水能力,反映在基本无变化的膨压消失点的相对含水量(R0)、叶表面水分散失率(WL0)和明显高于CK的一定ψw下的相对含水量(R)值以及无灌溉园较高的εmax或|β|等方面。 相似文献
10.