进入鲁迅精神后园的路标--重释"两株枣树"

联系作者的创作心态和时代背景,通过深入的文本细读和对相关文本分析,对长期争执不休的《秋夜》开篇"两株枣树"的写法给予新解。指出这奇崛的两株树是破译鲁迅《野草》的密码之钥,是进入鲁迅"精神后园"的入口路标。     

提高棉田棉株分布均匀度是夺取棉花高产与品质的重要因素

<正>棉花生产是一个复杂的系统.棉花的生长发育有其自身的规律、棉花生长发育与环境因素间的关系是一个复杂的动态过程,栽培措施对二者能起调节和控制作用。棉花高产优质栽培主要是协调好群体与个体、生殖生长与营养生长的关系,深入认识和调节这两对矛盾,力争多结优质铃是夺取棉花高产优质的关键. 当前各棉区棉田密度加大后,部分棉田出现棉株生长偏高、空果枝比例较大、三类苗偏多的问题,这是制约产量提高的主要障碍因素。为了建立棉田的、“小个体、大群体”的合理群体结构,我所在科技服务中,对当前棉田的两种播种留苗方式的田间棉株分布均匀度进行了调查,现将调查结果报告如下:     

石斛兰的繁殖技术

石斛兰(Dendrobium)是兰科植物的一大族，有1500-1600个原生种，原产于中国、日本、菲律宾、泰国、印度、马来西亚、澳大利亚等国。在我国的分布中心是云南、广西、广东、贵州和台湾。石斛兰花形、花姿优美，色彩艳丽，花期长，观赏价值高，是目前国际花卉市场上主要切花品种之一。现将其繁殖技术介绍如下：     

Molecular dissection of plant height QTLs using recombinant inbred lines from hybrids between common wheat （Triticum aestivum L.） and spelt wheat （Triticum spelta L.）

In wheat, plant height is an important agronomic trait, and a number of quantitative trait loci (QTLs) controlling plant height have been located. In this study, using the conditional and unconditional QTL mapping methods, combined with data from five different growth stages over two years of field trials, the developmental behavior for plant height in wheat was dissected. Nine unconditional QTLs and 8 conditional QTLs were identified, of which 6 were detected by both methods. None of the 11 QTLs was detected at all of the 5 investigated developmental stages, but 7 QTLs were detected at certain stages in both years. Further analysis identified 9 unconditional QTLs at different stages, which could explain the phenotypic variation from 4.81% to 17.35%. It was noteworthy that one major QTL designated QHt-4B-2, which was located on chromosome 4B, was detected on May 18 and 25 in both years, and its genetic contributions to plant height ranged from 13.42% to 16.13%. Moreover, of the 8 conditional QTLs identified, six were detected in both years, in the order of QHt-3B→QHt-4B-1→QHt-4B-2→QHt-4D→QHt-5A and QHt-2B expressed at the same developmental stage. The results indicate that QTL expression during plant height development is selective and in a temporal order.     

斜纹夜蛾核多角体病毒郴州株的大田示范效果

通过对斜纹夜蛾核多角体病毒（Spodoptera litura nuclear polyhedrosis virus）示范推广、施药方法改良、残毒检测的应用与研究,得到此病毒增效剂的平均防效为768％,其防效最优,且其使用浓度比广州病毒低2倍,天敌种类、数量都有增加,经济效益增效明显,其增净产值比清水对照、常规分别高2623．5、1014.0元／公顷,经捡测,其农药残毒量最低。     

庄浪县旱地玉米减穴增株技术研究试验初报

玉米是庄浪县主要的粮饲兼用作物之一,常年播种面积在1.53万hm2左右.由于现阶段全膜双垄沟播玉米人工单粒播种费时费工、缺苗严重,补种后植株生长不一致,易出现弱苗,整齐度差,影响玉米产量的整体提高.在保证玉米产量不降低的情况下,为了研究高产高效协同的玉米播种技术,在庄浪县旱地梯田全膜双垄沟播栽培条件下,以每穴保苗1株为...