许多养蜂人把蜂场打理得井井有条,走进蜂场,整整齐齐的蜂箱,不仅只是方便管理,还讲究造型,给人以美感.有摆成品字形,呈梯形阵势;有摆成圆弧形,像张开的纸扇;有一字排开,整齐划一.打开蜂群看看,所有群势大致相同,所有蜂王都是同期培育的,巢内摆放的蜂框数也相差不大.在生产初期是上5下8,或上5下6,蜂数大体相等,连蜂箱的使用时间也是同一时期.这样均等的群势,管理操作基本相同,蜂场管理效率高,节约时间,降低成本.
The upper earshoots with higher superiority usually have higher yield potential and higher efficiency. To determine the key period for the asynchronous differentiation of superior and inferior earshoots and how hormones are involved in this process, a two
Cotton (Gossypium hirsutum L.) is a globally important crop that is often damaged by pests and diseases. Current cotton pests and diseases management is dependent on chemical pesticides. Although chemical pesticides are usually effective, long-term applic
Nitrogen (N) deep placement has been found to reduce N leaching and increase N use efficiency in paddy fields. However, relatively little is known how bacterial consortia, especially abundant and rare taxa, respond to N deep placement, which is critical f
C-type lectins (CTLs) are a superfamily of Ca2+-dependent carbohydrate-recognition proteins, and an important pattern recognition receptor (PRR) in insect innate immunity which can mediate humoral and cellular immunity in insects. In this study, we report
Microbes are decomposers of crop residues, and climatic factors and residue composition are known to influence microbial growth and community composition, which in turn regulate residue decomposition. However, the succession of the bacterial community dur
The Northeast Plain is the largest maize production area in China, and drip irrigation has recently been proposed to cope with the effects of frequent droughts and to improve water use efficiency (WUE). In order to develop an efficient and environmentally
蜂群一旦起盗会给蜂场带来重大损失.起盗原因有多种,主要发生在外界蜜源缺乏时,制止盗蜂应以预防为主,辅以止盗措施,才能有效避免损失.rn一、预防盗蜂入侵rn1.外部防护rn把蜂箱缝隙糊严,盗蜂无法入侵.缺蜜季节缩小巢门,只能1～2只蜂出入即可.
文章旨在评估不同处理方式高粱型日粮对肉鸡生长性能、养分消化及胴体性状的影响.试验将520只平均初始体重接近的肉仔鸡随机分为4组,每组5个重复,每个重复26只,试验日粮分为4组,采用多因素设计,即2种高粱处理方式(膨化和制粒)及2种粉碎粒度(500μm和800μm),分别作为T1～T4组.结果:T1和T2组肉鸡的料重比显著低于T3组(P<0.05).饲喂膨化高粱日粮的肉鸡料重比显著低于制粒组(P0.05).T3和T4组肉鸡赖氨酸表观消化率显著高于T1和T2组(P<0.05),而T1和T3组肉鸡精氨酸表观消化
Soybean cyst nematode (SCN, Heterodera glycines Ichinohe) is one of the most important pests causing considerable damage to soybean (Glycine max (L.) Merr.) around the world. Biocontrol provides a strategy for sustainable nematode control. Previously, Asp