Evaluation of the Low-Temperature Tolerance of Cotton Varieties in the Huang-Huai Region during Seed Germination

[Objective] To provide a theoretical foundation and germplasm resources for low-temperature-germination cotton breeding, the germination characteristics of 38 cotton varieties novel to or formerly widely planted in the Huang-Huai Region were evaluated under different low temperature stress conditions. [Method] Analysis of variance, the fuzzy membership function method, and cluster analysis were used to comprehensively evaluate the tolerance of these varieties to low temperature stress. [Result] As the temperature was lowered, germination rate, germination index, and vigor index exhibited a decreasing trend in all cotton varieties, but resistance to low temperature was significantly different among varieties. Cluster analysis divided the 38 varieties into three categories: highly resistant, resistant, and non-resistant. [Conclusion] Early-introduced varieties and those bred from early-introduced germplasm resources had weaker resistance to low temperature stress, with Stoneville and Deltapine series showing the lowest tolerance. The new transgenic insect-resistant cotton varieties SCRC 37 and SCRC 36 had the strongest resistance to low temperature stress.     

沼液在日光温室番茄和黄瓜栽培上的应用效果初探

随着沼气建设在农业生产中的推广应用,沼液作为一种优质的有机肥在生产中逐渐应用推广。通过对沼液在日光温室番茄和黄瓜栽培上的应用效果进行试验研究,结果表明,喷施60％液或根施100％沼液增产效果好,建议在保护地番茄和黄瓜生产中采用。     

不同棉花品种种子萌发期耐旱性综合评价

本试验选用45个黄淮棉区不同时期的代表性棉花品种为材料,采用15%PEG-6000溶液模拟干旱胁迫,测定各品种的种子发芽势、发芽率、发芽指数和单株干重、幼苗长度,计算5个萌发指标的相对值,分析各品种萌发指标的差异,并利用模糊隶属函数、相关分析等方法对45个棉花品种萌发期的耐旱性进行综合评价,为萌发期抗旱种质筛选及抗旱棉花新品种选育提供理论依据。结果表明,干旱胁迫抑制45个棉花品种萌发,品种间存在显著差异;相关分析显示,耐旱评价值与5个鉴定指标均呈正相关关系,与相对发芽势、相对发芽率、相对发芽指数呈极显著正相关;依据耐旱评价值将45个棉花品种分为高抗旱、抗旱、耐旱、不耐旱4个等级,其中高抗旱品种1个、抗旱品种7个、耐旱品种30个、不耐旱品种7个。说明过去或当前主栽棉花品种萌发期高抗旱及抗旱品种较少,为应对当前旱情加剧趋势,今后棉花育种需加强对萌发期抗旱品种的筛选。     

沼液在日光温室芹菜和油菜栽培上的应用效果初探

随着沼气建设在农业中的推广应用．沼液作为一种优质的有机肥在生产中逐渐被应用。沼液的实际养分含量不是很高,但是沼液其液体中所含养分都是速效性的,便于吸收。目前,生产中沼液基本用于浸种、叶面喷施以及根外追肥．包头大多用于叶面喷施,由于农户大多是自行实施,施用浓度不一。