集约化养猪粪便理化性质和堆肥工艺的研究     

冯亚辉 《中国农业文摘-农业工程》2023,35(3):53-58

【目的】研究集约化养猪粪便理化性质和发酵条件对堆肥速率和堆肥品质的影响，为畜禽粪便资源化利用提供理论依据。【方法】于2020年5月至2021年4月以纯猪粪为原料进行了好氧堆肥试验，试验以曝气量和翻抛频率为变量，设计了6个试验处理，分别表示为TI、T2、T3、T4、T5、T6。【结果】(1)好氧发酵16天后各处理的猪粪均达到无害化标准，有机质和养分含量均符合NY/T525-2012标准；(2)处理TI、T2、T3、T4、T5、T6的猪粪含水率平均每天分别下降1.25%、1.13%、1.32%、1.75%、1.50%、1.57%，总碳损失率分别为25.54%、39.04%、32.70%、45.47%、44.47%、40.11%，总氮损失率分别为9.35%、20.25%、16.13%、9.65%、16.39%、13.00%;(3)处理TI、T2、T3、T4、T5、T6的堆肥T值分别为0.81、0.57、0.80、0.60、0.68、0.71，猪粪发酵后的种子发芽指数分别为68%、85%、72%、89%、95%、83%;(4)T1、T2、T5、T6猪粪发酵后的电导率分别为4423μs/cm、4...  相似文献   

Studies of Enteric Pathogens and γ-Globulin Levels of Neonatal Calves in Sweden     

S. Viring  S.-O. Olsson  S. Alenius  U. Emanuelsson  S.-O. Jacobsson  B. Larsson  N. Linde  A. Uggla 《Acta veterinaria Scandinavica》1993,34(3):271

Viring, S., S.-O. Olsson, S. Alenius, U. Emanuelsson, S.-O. Jacobsson, B. Larsson, N. Linde and A. Uggla: Studies of enteric pathogens and γ-globulin levels of neonatal calves in Sweden. Acta vet. scand. 1993, 34, 271-279.– Faecal and blood samples were taken from 10-30% of calves, 36 hours to 14 days old, in 47 dairy herds in different regions of Sweden from September 1987 to October 1988 (Olsson et al 1993). Faecal samples from 279 calves were analysed for the presence of Escherichia coli (K99⁺), rotavirus and Cryptosporidium sp. Twenty (7.2%) of these samples were from diarrhoeic calves. An ELISA was developed and used for the rotavirus analysis. E. coli K99⁺ was detected in 11.5%, Cryptosporidium sp. in 6.1% and rotavirus in 5.4% of the faecal samples. The presence of rotavirus alone and the combination rotavirus and E. coli (K99⁺) was found to be associated with diarrhoea (p<0.001 and p<0.01 respectively).Blood samples from 327 calves were analysed for the level of total protein and γ-globulin. In 43 of these samples (13%) γ-globulin did not separate from the ß₂-region by electrophoresis. The mean total protein concentration was 53.6 g/1 in calves free from diarrhoea. The mean γ-globulin concentration, adjusted to 7 days age was 5.9 g/1. The 20 diarrhoeic calves had lower levels of both total protein and γ-globulin, compared with calves without diarrhoea, but the difference was not significant. One litre more of colostrum at the first feed increased the level of total protein of the calves’ sera by 1.4 g/1 (p = 0.05). Calves born between May and September had a 2.0 g/1 higher (p<0.001) serum concentration of γ-globulin than calves born between October and April.  相似文献   

四湖地区“四型九式”农田作物高产高效机理研究   总被引：1，自引：1，他引：0  

王鹄生  杜志华  彭景武 《农业现代化研究》1996,(2)

“七五”、“八五”期间，在以“水袋子”闻名于全国的湖北省四湖地区（三湖、长湖、洪湖、白露湖）进行了湿地农业的生态对策研究。１９９０－１９９３年，我们设计了“四型９式”的不同种植模式，探讨在涝洼农区获得高产高效的机理。研究结果表明：“粮经型”、“粮鱼型”、“粮饲型”和“全粮型”，乃是渍害农田高效经济与生态规律之统一。  相似文献   

The Effect of Different Shade Levels on Growth and Tuber Yield of Sweet Potato: II. Tuber Yield     

A. Oswald    J. Alkämper  D. J. Midmore 《Journal of Agronomy and Crop Science》1995,175(1):29-40

Eight sweet potato cultivars ( Ipomoea batatas Lam.) were grown under four different light regimes (0, 26, 42 and 60 % light reduction (LR)) at two experimental sites of the International Potato Center (CIP) in Peru during the 1990 and 1991 growing season. Increasing shade diminished the tuber yield of five cultivars, two showed a tolerance for slight (26 % LR) and moderate (42 % LR) shade and one had the same yield in full sunshine and slight shade. Shade mainly reduced the sink-size (tubers m ⁻²) of sweet potato and to a lesser extent the sink-strength. The growth of the plant top was hardly affected by shade; slight shade even favoured shoot development of some cultivars. The plant top was the stronger sink under shade conditions and tuber yield was not only reduced by lesser assimilate production as a whole but also by an altered assimilate partitioning.  相似文献   

无穷时滞泛函微分方程解的完全全局稳定性     

陈强  陈海明 《湖南农业大学学报(自然科学版)》1996,23(2)

建立了无穷时滞泛函微分方程完全有界性与完全全局渐近稳定性的概念及基本定理。  相似文献   

新疆木材总需求与总供给     

张新兵  李文胜 《新疆农业大学学报》1996,19(3):62-66

从木材的需求与供给出发，进行木材总量、个量和结构的分析，界定了新疆木材需求与供给的差额和结构变化，揭示了新疆木材在总量和结构方面存在的危机  相似文献   

叶霉病对豇豆叶片有机物含量的影响     

何冬兰  王就光 《湖北农学院学报》1992,12(2):39-42

对叶霉病抗性不同的4个豇豆品种芝豇28～2、白豇2号、红嘴燕、张瑭等发病后,叶片中的总糖和淀粉含量下降,而还原糖含量却反而增加。发病后的豇豆叶片内的氨基酸种类仍为17种,但氨基酸的总含量和绝大部分氨基酸的含量都降低了,其中以脯氨酸、苯丙氨酸、谷氨酸、精氨酸下降较多。  相似文献   

Measurement of Some Physiological and Biochemical Indexes of the Antisense Fragment of CYP86MF Gene Transgenic Male Sterile Plantlets in Chinese Cabbage-Pak-Choi   总被引：1，自引：0，他引：1  

YU Xiao-lin  CAO Jia-shu  DONG De-kun 《中国农业科学(英文版)》2003,2(11)

In order to study the mechanism of the transgenic male sterility induced by the antisense fragment of gene CYP86MF, some physiological and biochemical indexes were compared between the transgenic plantlets of Chinese cabbage-pak-choi (Brassica campestris L. ssp. chinensis Makino) and their controls.Results showed that there was significant difference between content of the endogenous hormones in leaves and floral buds. GA3 contents in leaves of the transgenic plantlets of B. campestris L. ssp. chinensis Makino cv.Shanghai-qing and cv. Youqing were reduced by 31.72 and 46.88% respectively as compared with those of their controls, and GA3 contents in floral buds of them were reduced by 62.92 and 80.57 % respectively. In addition, ZT contents in leaves of cv. Shanghai-qing and cv. Youqing were reduced by 11.81 and 181.20%respectively as compared with those of their controls and those in floral buds were reduced by 105.94 and 128.75% respectively. But, ABA content in transgenic plantlets was significantly higher than that in nontransgenic plantlets. However, differences among respiratory rate and cyanide-resistant respiratory rate, the photosynthesic rate and the content of total flavones in floral buds were not significant. In this study, the results indicated that the gene CYP86MF might be one of the key functional genes to control fertility of Chinese cabbage.  相似文献   

应用模糊数学方法评价蛋品质     

孙宪如  卢一凡 《吉林农业大学学报》1989,11(1):65-69,83

本文讨论了应用模糊数学方法评价蛋品质的可行性。对尼克鸡60枚蛋的评价结果表明,该方法与加权评分法一致,皆为81～91分,而且使用该方法还可以进行名次排列,对尼克鸡不同AKP同功酶型鸡蛋品质评价表明,快带型优于慢带型。与蛋品质理化检验结果一致。  相似文献   

不同补饲方案对妊娠绒山羊冬春体况及胎儿发育的影响   总被引：2，自引：0，他引：2  

王若军  王守清  张润悟 《动物营养学报》1992,(2)

结合放牧,给妊娠70天的绒山羊补饲精料和粗料,可使其在冬末早春处于增重状态。随着补饲水平的提高,母羊增重、羔羊初生重及初生羔羊皮肤的总体毛囊密度、次级毛囊密度和次级毛囊数与初级毛囊数的比值(S/P)均有不同程度的提高,但初级毛囊密度并不受影响。母体较胎儿对改善营养更敏感,胎儿快速增重与次级毛囊生长同期进行。羔羊出生时绝大多数初级毛囊已进入活动状态,而次级毛囊尚未开始活动。初生羔羊较成年山羊具有较低的S/P值和较高的总体毛囊密度。  相似文献