不同燕麦品种在尼泊尔北部山区的生长特性及其营养品质的研究

畜牧业是尼泊尔北部山区的重要生计支柱,提升牧草产量是我国对尼泊尔开展农业技术援助的关键领域。为筛选出适宜尼泊尔北部山区栽培的燕麦品种,于2019年5-10月在尼泊尔热索瓦县郎唐山区对12个燕麦品种(爱沃、太阳神、贝勒1、美达、科纳、林纳、青引1号、青海444、青海甜燕麦、陇燕2号、陇燕3号、Kamadhenu)的物候期、株高、产草量、穗含量、叶茎比和关键营养成分等进行了品比试验。结果表明:美达、科纳、青引1号、青海444、青海甜燕麦和Kamadhenu 6个品种能完成生育期,生育天数在115~141 d,其余多数品种只能达到乳熟期。各燕麦品种的株高为134.8~177.7 cm,其中引进品种太阳神、青海444、青海甜燕麦、美达和林纳的株高较对照品种Kamadhenu高6.3%~20.4%,存在极显著差异(P<0.01)。青海甜燕麦、青海444和美达的干草产量分别达到了14723.0、13491.0和13369.6 kg·hm^(-2),分别比对照品种Kamadhenu增产36.0%、24.7%和23.6%,差异极显著(P<0.01)。贝勒1、科纳和太阳神的叶茎比分别为0.40、0.38和0.36,是对照品种Kamadhenu的1.50~1.67倍。各燕麦品种的干物质、粗蛋白、总灰分、中性洗涤纤维和酸性洗涤纤维含量变化范围分别为93.5%~95.6%、5.7%~9.9%、4.4%~6.9%、68.2%~78.4%和39.3%~48.7%,其中太阳神的粗蛋白含量是对照品种Kamadhenu的1.57倍,存在极显著差异(P<0.01)。对各燕麦品种的10个农艺性状进行主成分分析及综合评价,结果表明,引进品种青海甜燕麦、美达、青海444和太阳神综合适应性较好,适宜在该地区推广种植。

Optimization of M/M/s/N Queueing Model with Reneging in a Fuzzy Environment

This paper deals with the study of multi-server queueing model in a fuzzy environment with imposition of reneging of customers. Entry of the customers in the system is assumed to be Poisson process and exponential service time distribution under first-come-first-served basis. Specific of this investigation is to derive the various fuzzy performance measures such as fuzzy queue length, fuzzy waiting time in queue, fuzzy response time and fuzzy optimal number of servers in explicit form for the finite capacity multi-server queueing system by using recursive method. For the validity of the model we have obtained the numerical illustrations in tabular form which shows that fuzzy-queue can be more realistic than crisp queue.