‘商甘蓝一号’露地越冬高产栽培技术

‘商甘蓝一号’露地越冬栽培的高产技术要点:适播期9月底至10月上旬,667 m2栽植3 300株,莲座期和结球初期2次追肥,或莲座期、结球初期和结球中期分期追肥为好,667 m2追施尿素30~35 kg为佳。     

滚压对四川野生狗牙根生物学和生理学特征的影响

选取前期试验中筛选的坪用价值优异的狗牙根野生资源为研究材料,采用二因素裂区试验小区建坪,模拟足球场草坪的运动受力进行滚压处理,研究不同滚压强度对野生狗牙根的影响及不同材料间表现的差异.试验结果表明:不同滚压处理对狗牙根草坪的盖度、地上生物量、分蘖数、单位面积粗纤维、叶绿素和可溶性糖含量都存在不同程度的影响作用.不同材料之间也存在差异:生物学特征方面:嘉陵江流域的J7的草坪盖度和分蘖数均高于对照Jackpot,岷江流域的M28、M22两份材料次之,青衣江流域的Q10表现最差;生理学特征方面:单位面积的粗纤维、叶绿素、可溶性糖含量均是J7表现最好,其含量均高于对照Jackpot,其次是M22和M28,Q10最低.     

不同施肥水平与组合对玉米生产性能的影响研究

应用三因素最优设计构造试验方案,研究氮肥、磷肥、钾肥不同水平与组合对玉米产量的动态关系。结果表明,磷肥对产量的影响最大,氮肥较小,钾肥居中。氮、磷、钾肥之间存在一定的交互作用,其中氮肥、磷肥间的交互作用较大,钾肥与磷肥间的交互作用较小。在试验范围内,就玉米籽粒产量而言,施肥量投入应为N:149.87～207.07kg/hm2,P2O5:38.23～143.52kg/hm2,K2O:24.63～129.91kg/hm2在此施肥范围内,可预报玉米籽粒产量为4707.5～5616.2kg/hm2。     

日光温室西瓜产量影响因素通径分析及水分生产函数

该文以温室小型西瓜为试材,采用日光温室内E601型蒸发器蒸发量值控制灌溉水量,在西瓜的不同生育阶段设置4个灌水水平,研究不同生长阶段不同土壤水分条件对产量的影响,得出产量与水分之间的函数关系;以株高、茎粗、叶面积指数（LAI）、地上部干质量和根干质量为产量影响因素,通过通径分析方法,计算它们与产量之间的直接通径系数和间接通径系数。结果表明：温室西瓜在滴灌条件下总产量与总耗水量之间呈二次函数关系,最佳灌水量为107 mm;水分敏感指数在果实膨大期最大,开花坐果期次之,苗期和成熟期水分敏感指数较低;产量与茎粗、LAI和根干质量之间的单相关系数均达到显著和极显著水平,而茎粗和根系干质量可作为评价小型西瓜高产的单个因素。     

华山松种子不同处理方法育苗试验

采用正交试验设计,研究不同层积时间、不同水温浸种以及变温和恒温处理方式对华松山种子播种育苗的影响的结果表明:华松山种子层积60天效果好于90天,温水浸种好于凉水浸种,变温处理优于恒温处理,其中以温水浸种7天后,变温层积60天,华山松出苗率最高,且地径生长量最大。     

A wind tunnel experiment to investigate the effect of polyvinyl acetate,biochar, and bentonite on wind erosion control

Due to the heavy costs of wind erosion control measures, the correct selection of technical methods is indispensable for a sustainable land management in arid and semiarid regions. Thus, the main goal of this research was to investigate the feasibility of using the clay minerals (i.e., bentonite), polyvinyl acetate and palm biochar for reducing the wind erosion in deserts surrounding the cities. The treatments were sprayed uniformly onto the containers (5 × 35 × 105 cm, 0.37 m²) with sand (collected from sand dunes surrounding Isfahan city, central Iran) in 3 replicates. The experiments were conducted in a wind tunnel with sequential repetitions after 1, 10, and 20 weeks. Among the studied treatments, the bentonite planters demonstrated to be the most effective soil erosion control measure by reducing soil loss and improving sand ablation. On the contrary, the palm biochar had less influence on the soil erosion control and only a slight effect on the threshold speed. For the future, further studies are required to select the best and most relevant soil erosion control measures under field conditions considering all the environmental aspects in arid regions of Iran.     

黄粉虫蛹不同处理方式对人工繁育川硬皮肿腿蜂的影响

研究乙醇和低温处理黄粉虫蛹后对繁育川硬皮肿腿蜂的影响。结果表明:有或者没有乙醇处理,不同蛹龄的黄粉虫蛹均对肿腿蜂寄生效果有明显影响。肿腿蜂对蛹龄小的黄粉虫蛹寄生效果好,但对蛹龄大的黄粉虫蛹寄生率相对低,且不能寄生未经乙醇处理过的2日龄以后的黄粉虫蛹。用75%乙醇处理蛹龄0～12 h的黄粉虫蛹2 h可以显著提高肿腿蜂的产蜂量;-6℃低温冻藏黄粉虫初蛹24 h也可显著提高肿腿蜂的寄生效果,肿腿蜂出蜂率可达65%,平均产蜂量达21头左右。由此可见,黄粉虫蛹经过75%乙醇溶液处理或低温贮藏处理后,可明显提升肿腿蜂的寄生效果。     

不同处理对赤芍种子萌发的影响研究现状

目前对于赤芍种子萌发的研究已有很多,本文通过总结国内外对不同处理对芍药属种 子萌发特性的影响的相关研究,从不同条件层积处理对芍药属种子萌发的影响;GA3 与CTK 对 芍药属种子萌发的影响;其他处理对赤芍种子萌发的影响等角度进行分析,从而为以后研究赤 芍种子萌发的试验提供相应的理论依据。     

不同施肥量对高原夏季青花菜产量、品质及养分吸收的影响

探索不同施肥量处理对高原夏菜的影响效应,以青花菜为试验材料,在大田条件下研究不同施肥量处理对青花菜产量、品质及养分吸收的影响,为甘肃省河西地区高原夏季青花菜制定合理施肥方案与优质高效生产提供理论依据。结果表明：氮肥是影响产量的关键因素,高氮处理的产量、花球紧实度和花球叶绿素含量比低氮处理高;而高氮和较高的氮、磷比例以及钾肥不足可导致青花菜硝酸盐含量增加、可溶性糖含量下降;施肥量过高或过低,都会使Vc含量降低。青花菜植株对氮、磷、钾的吸收以钾最多,氮次之,磷最少。相关性分析表明,青花菜植株内氮、钾含量与产量和花球叶绿素含量极显著正相关,磷含量与可溶性糖、Vc含量极显著正相关,说明充足的氮、磷、钾营养对青花菜产量与品质的提高具有重要意义。合理的氮磷钾配施可调控青花菜主要矿质养分的吸收与分配,促进叶片与花球中养分的积累,从而提高花球的产量与品质。     

Ultraviolet irradiation is an effective alternative to ozonation as a sea water treatment to prevent Kudoa neurophila (Myxozoa: Myxosporea) infection of striped trumpeter,Latris lineata (Forster)

Myxozoan parasites are known pathogens of cultured finfish. Kudoa neurophila n. comb. (Grossel, Dyková, Handlinger & Munday) has historically infected hatchery‐produced striped trumpeter, Latris lineata (Forster in Bloch and Schneider), a candidate species for seacage aquaculture in Australia. We examined the efficacy of four water treatment methods to prevent K. neurophila infection in post‐larval (paperfish) and juvenile striped trumpeter. Treatments included dose‐controlled ultraviolet irradiation [hydro‐optic disinfection (HOD)], ozone with conventional UV (ozone), mechanical filtration at 25 μm and then foam fractionation (primary filtration), and 50‐μm‐filtered sea water (control). In post‐larvae (initially 10.3 ± 2.7 g, mean ± SD, 259 days post‐hatching, dph), the infection prevalence (PCR test) after 51 days was 93 ± 12% in the control, 100 ± 0% in primary filtration and 0 ± 0% in both ozone and HOD. Likewise, in juveniles (initially 114 ± 18 g, 428 dph), prevalence was 100 ± 0% in the control and primary filtration treatments with no infection detected in ozone and HOD. Concurrently, there was a 50–100% reduction in heterotrophic bacteria and 100% reduction in presumptive Vibrio sp. in sea water HOD and ozone treatments. HOD with a dose of ≥44 mJ cm^?2 UV was as effective as ozonation at >700 mV ORP for 10 min, in preventing K. neurophila infection.