高产、优质糯玉米新品种龙育糯1号的选育及特征特性

龙育糯1号玉米是黑龙江省农科院草业研究所于2001年以自选系T105为母本,外引系糯2为父本杂交组配而成的黄糯玉米杂交种。2008年通过黑龙江省农作物品种审定委员会审定。该品种具有高产、抗逆性强、品质优良和风味佳等诸多优点,是鲜穗出售或速冻、真空包装保鲜加工的理想品种。     

PEG胁迫对柠条种子萌发及生理特性的影响

研究了不同温度条件下,不同PEG浓度对柠条两个栽培种(中间锦鸡儿和柠条锦鸡儿)种子萌发的影响.结果表明:随PEG浓度升高,种子发芽率降低;种子萌发时α-淀粉酶活性、POD活性降低,MDA含量升高.其中25/20℃条件下,5%PEG处理种子的发芽率和酶活性最高.相同温度和低于15%PEG条件下,柠条锦鸡儿的发芽率和发芽势高于中间锦鸡儿.     

浅谈种子包装科学化规范化

从我国种子包装发展史入手,针对溧阳市种子市场种子包装基本情况,发现包装存在不合理、不合法的一些现象,分析存在问题的根源,并提出提高种子包装科学化规范化的几点思考.     

超高产栽培杂交中籼稻的生长发育特性

以5个杂交中籼稻品种(含品系)扬两优6号、P88S/747、珞优8号、珞优234和天两优2号为材料,研究大田条件下超高产水平(产量≥12.0 t hm^-2)的物质生产、产量构成及养分吸收特性。试验结果表明,与高产水稻(产量≥9.0 t hm^-2)相比,超高产水稻具有以下特征,幼穗分化期、齐穗期和灌浆结实期(齐穗后10 d) LAI大,分别为6.5~7.2、8.5~8.9和6.5~7.0;齐穗期的高效叶面积比率高,为60.0%~66.5%;齐穗期、灌浆期和成熟期积累较多的干物质,分别为13.5~15.0、15.0~16.0和25.0~28.0 t hm^-2;分蘖盛期对氮(N)、磷(P)、钾(K)吸收利用优势不明显,而幼穗分化期、齐穗期和成熟期对N、P、K 吸收利用高而且积累速度快。此外,具有穗数多(有效穗数介于250×10⁴ ~290×10⁴ 穗 hm^-2)、结实率高(88.2%~92.3%)、千粒重大(29.0~31.0 g)的特点。     

东北地区大豆胞囊线虫卵定殖真菌的多样性研究

采用蔗糖梯度离心法及形态与分子方法相结合的真菌鉴定技术,对黑龙江、吉林和辽宁3省的大豆田根际土进行分离鉴定,分析土壤中大豆胞囊线虫卵定殖真菌种类及多样性.研究结果显示,采自黑龙江、吉林和辽宁38个县市大豆田根际的122份土样中,共分离获得真菌菌株3 937株,鉴定出24个不同的属.Paecilomyces spp.,V...     

吉林省水稻品种对稻瘟病的抗性分析

选用22个稻瘟菌鉴别菌株,采用离体叶片接种法对吉林省全部水稻主栽品种及育种材料(98个)的抗瘟性进行了鉴定.结果显示,吉林省主栽水稻品种对稻瘟病的抗性较弱,高达98%的供试品种均可以被稻瘟菌不同程度地侵染;本研究筛选到3个品种:超级稻2号、吉粳801、吉粳806,具有极高的抗瘟性,为将来克隆新的抗瘟基因及培育新的抗瘟品...     

习水国家级自然保护区四川大头茶群落研究

以习水国家级自然保护区天然四川大头茶群落为调查研究对象,分析了群落的物种组成、外貌特征和结构特征,定量计测了乔木层主要树种的群落特征指标.结果表明,习水自然保护区四川大头茶群落植物共有31科49属53种;垂直结构明显,分为乔木层、灌木层、草本层,乔木层的物种多样性指数较高,物种丰富;四川大头茶在群落中处于优势种地位;群落结构趋于稳定.     

Early-warning Indicators of Acidification in the Single-phase Anaerobic Digestion Process for Food Wastes

The commonly used indicators are often too slow to reflect the operating status in time.Confronted with lacking reliable early-warning indices in the single-phase anaerobic digestion for kitchen waste which is easy to decay,lab-scale experiments of start-up and continuous operation process of anaerobic digestion for kitchen waste were carried out in the single-phase anaerobic reactor which is self-designed under mesophilic conditions.Those values which reflect the capacity of acidity-basicity resistance,including the ratio of bicarbonate alkalinity to total alkalinity (BA/TA),absolute testing value of volatile fatty acid (VFA) and the ratio of total concentration for volatile fatty acid to bicarbonate alkalinity (VFA/BA),are determinated to be the early-warning indices for acidification and imbalance of single-phase anaerobic digestion for kitchen waste.It is considered that,when VFA/BA＞0.8,BA/TA＜0.4 and VFA＞3000mg/L,buffering capacity of the system is very poor,and the system might be out of control.Therefore,an immediately steps must be taken.While,when BA/TA≥0.7~0.8 and VFA/BA＜0.4,the alkalinity of system is relatively better and the process can be operated with higher organic volumetric loading,which can raise the biogas-producing efficiency and get economic benefit.     

A simulated experiment on the high titanium slag rheological behavior

The rheological property of high titanium slag is a main factor to influence the vanadium titanomagnetite smelting in blast furnace. It plays a great role in discharging slag, separating iron and slag and even the life of blast furnace hearth. The acrylonitrile-butadiene-styrene multipolymer(ABS) dense suspension is taken to simulate the system of high titanium slag. Apparent viscosity is measured by a NXS-11A rotating cylinder viscometer. The impact of temperature, volume fraction and particle sizes on the suspension apparent viscosity is studied. The results show that temperature and volume fraction have a strong influence on the suspension apparent viscosity, while the particle size has a weak effect. The suspension shows Bingham behavior within a wide concentration range. The dependence of the appear viscosity on temperature and amount of solid addition can be described by a binary function equation.     

Effect of silicon on the eutectic carbides in as-heated M2 high speed steel

The effect of silicon on the eutectic carbides in as-heated M2 high speed steels is investigated by using optical microscope, scanning electron microscope, energy dispersive spectrometer and X-ray diffraction analysis. The high speed steel ingots with different silicon additions are produced by electroslag remelting process (the mass content of silicon is 0.3%, 0.8%, 1.6% and 2.4%, respectively). The ingots are annealed at 780 ℃ for 10 h and heated at 1 165 ℃ for 2.5 h. The results show that the eutectic carbides distributed in the dendrites with continuous or semi-continuous net-shape in the as-annealed ingots. The eutectic carbides change from lamellar-like M2C to herringbone-like M6C with the increase of silicon content. After 2.5 h heating at 1 165 ℃, the lamellar-like M2C decomposes into granular M6C and MC, and the size of granules in M2 high speed steel ingot with 0.8%Si addition is smaller than that in the 0.3%Si. Whereas herringbone-like M6C is unchanged during heating treatment, and coarse primary blocky carbides which are harmful for properties still exists after the deformation.