不同播期与播量对不同类型超级小麦产量的影响

以大穗型(01-35、8355)、中间型[6200(8)、4133-2]和多穗型(988044、02-48)3种类型的超级小麦品种(系)为材料,研究不同播期与播量对不同类型品种(系)小麦穗数、穗粒数、千粒重和产量的变化。结果表明:大穗型品种最佳播期在10月15日,中间型、多穗型品种最佳播期在10月5日;播期对穗数的影响差别最高可达15%以上,对穗粒数、千粒重和产量的影响差别均在13%以下;播量对其各项指标的影响差别均在5%以下。3种类型品种小麦均以中、高密度播量较高,播期对超级小麦产量各构成因素的影响大于播量。     

作物叶片持液量与溶液表面张力的关系

将靶标作物水稻、甘蓝苞菜、豇豆和棉花叶片在不同浓度的表面活性剂溶液中浸泡10 s,分别测定其叶片持液量。结果表明:疏水型的水稻和甘蓝包菜,无论溶液内表面活性剂是否达到临界胶束浓度,只要溶液的表面张力大于叶片的临界表面张力,叶面的持液量就少;当溶液的表面张力适度小于叶片的临界表面张力,溶液内表面活性剂达到临界胶束浓度时,其叶面持液量就多;而亲水型的棉花和豇豆的叶面持液量则随溶液表面张力下降而减少。     

《竹子研究汇刊》性质及学科分类

根据期刊性质和学科分类方法,以文献数量为依据对《淡水渔业》进行分类。《竹子研究汇刊》2009年刊登的文献全为学术性,故归类为学术性期刊。此外,林业类文献占当年发表文献总量的72．41％,其他学科文献均较少,不能划入相应学科,故将该刊归类为以林业学科为主的综合性学术期刊。     

靖远县沿黄灌区春玉米平衡施肥研究

研究了氮、磷、钾肥用量对靖远县沿黄灌区春玉米经济性状与产量的影响,建立了氮肥（X1）、磷肥（X2）和钾肥（X3）与春玉米产量（Y）之间的回归方程。通过对回归方程优化解析,得出春玉米最佳施肥量为N365．25kg／hm^2、P2O576．96kg／hm^2,K2O103．50kg／hm^2,玉米产量可达15545,40kg／hm^2;最佳经济施肥量为N328．65kg／hm^2、P2O587．60kg／hm^2、K2O112．35kg／hm^2,玉米产量可达15532．50kg／hm^2。     

不同灌溉量对冬小麦旗叶叶绿素荧光特性的影响

[目的]研究在池栽试验条件下,不同灌溉量对冬小麦旗叶叶绿素荧光特性、籽粒产量的影响。[方法]试验在山东农业大学实验农场进行,选取高产小麦品种济麦20为试验材料。在拔节和开花期进行不同的灌溉量处理,于开花期测定小麦旗叶叶绿素荧光特性。[结果]随灌溉量的增加,小麦旗叶叶绿素荧光动力学参数Fm、Fv、Fv/Fm、Fv/Fo增加,Fo降低,说明灌水有利于叶片进行充分的光合作用,减缓叶片的光抑制程度和衰老进程。[结论]2次灌溉总量为60 mm（每次灌30 mm）的籽粒产量最高,为最佳灌溉量。     

部分南瓜品种资源数量分类初步研究

选取25个主要分类性状,对22个南瓜品种进行了数量分类研究。通过Q型聚类分析,综合考虑多个性状,反映出各品种之间的亲缘及演化关系。结果表明:Q型聚类分析得出的树系图,可以明显地将22种南瓜材料归为4类,即美洲南瓜、中国南瓜、印度南瓜和黑籽南瓜,与传统分类学的结果相符;R型聚类分析反映了各性状的信息,揭示了南瓜品种分类的关键,为今后进行性状观察、记载及取舍等提供了定量依据;同时,还探讨了南瓜品种间的亲缘关系。     

岩原鲤耗氧率和窒息点研究

在开放静止水体中测定岩原理Ｐｒｏｃｙｐｒｉｓ ｒａｂａｕｄｉ（Ｔｃｈａｎｇ）耗氧率（ＱＯ２）和窒息点。结果表明，温度从１９℃升到３２℃时，ＱＯ２变化范围为０．０９１３－０．１７６８ｍｇ／ｇ．ｈ＾－＾１。ＱＯ２在溶解氧浓度（ＤＯ）大于临界氧浓度时，基本恒定，小于临界氧浓度时，ＱＯ２随ＤＣ降低而降低。窒息点与温度呈正相关，并探讨了岩鲤人工驯化养殖的前景。     

The Assessment and Utilization of Straw Resources in China

The study was undertaken to evaluate the collectable and usable volume of existing straw resources, its suitability for different ways of utilization and fully reorganization of its development potential in China. Based on the results on the stubble heights of major crops in the Huang-Huai-Hai area （the area along the Yellow River, Huai River, and Hai River）, the evaluation of the collectable and usable coefficients, and the collectable and usable volumes of various straw resources in China were worked out during 2005. The respective collectable and usable volumes of straw resources were worked out on the basis of suitability as fuel, feed, fertilizer, and base material for edible mushrooms. The total collectable and utilizable quantity of straw in China was 685 950 000 t, and the mean collection coefficient was 0.81 during 2005. The quantity of straw residue and wasted straw accounted for 19%. The collectable and utilizable quantities of grain, cash crop, and other crop straw were 492 310 000, 162 610 000, and 31 030 000 t which accounted for 71.77, 23.71, and 4.52%, respectively of the total collectable and utilizable quantity of straw. The quantity of straw which could be used as fuel was 635 000 000 t, which accounted for 92.63% of total quantity of the straw in the country during 2005. Among the total quantity of collectable and utilizable straw in China during 2005, the quantities of straw suitable and unsuitable for being processed as feedstuff were 587 640 000 and 98 310 000 t, which accounted for 85.67 and 14.33%, respectively. The quantity of straw residue returned to the field and collectable and utilizable straw for direct field restoration was 616 000 000 t, which accounted for about three-fourths of the total straw yield, while the quantity of straw for cultivation of edible mushrooms and industrial processing was about 587 000 000 t, which accounted for more than 85% of the total collectable and utilizable straw. The evaluation results indicate that the collectable and utilizable quantity of straw in China is abundant and suitable for many purposes.     

《中国海洋大学学报(自然科学版)》性质及学科分类

根据期刊性质和学科分类方法,以文献数量为依据对《中国海洋大学学报(自然科学版)》进行分类。结果发现,《中国海洋大学学报(自然科学版)》2010年刊登的论文全为学术性,水产和渔业类及海洋学类文献数都超过该学科"20%区域"文献数均值,其余学科文献均较少,不能划入相应学科,因此应将该刊同时归类为水产和渔业类与海洋学类专业学术期刊。     

栽培措施对水稻产量和品质的影响

通过4年的试验,提出了水稻旱育稀植高产栽培中最佳育苗方式为抛秧盘育苗(3粒/孔)或旱 育秧播种量为150g/m2;采用33．3cm×20．0cm-26．7cm×20．0cm插秧方式,每穴插2-4苗,是吉林省水稻 旱育稀植栽培较为合理的栽培措施组合。利用该项栽培措施组合,不仅可以获得9t/hm2以上产量,而 且还可以提高和改善稻米品质。