草鱼种与泥鳅池塘双主养模式养殖试验

[目的]降低草鱼池塘养殖生产成本,提高池塘水体利用率和综合养殖效益,增强养殖模式的抗风险能力以及示范推广作用.[方法]在江苏省宿迁市宿城区中扬镇开展了草苗种、泥鳅池塘双主养模式养殖试验.[结果]放养260尾/kg的泥鳅苗种180 000尾/hm2,放养2 000尾/kg的草苗种60 000尾/hm2的养殖模式,以及放养260尾/kg的泥鳅苗种120 000尾/hm2,放养2 000尾/kg的草苗种75 000尾/hm2的养殖模式,产出投入比均较高.[结论]放养260尾/kg的泥鳅苗种120 000尾/hm2,放养2 000尾/kg的草苗种75 000尾/hm2的养殖模式更容易被养殖者接受,更容易被大面积推广应用.     

绵山羊双羔素提高藏羊繁殖率的研究

[目的]提高藏羊的繁殖率,降低牧区草场的载畜量,减少基础母羊存栏数.[方法]应用绵山羊双羔素(睾酮-3-羧甲基肟·牛血清白蛋白),对青海省海北州同宝牧场、海北州牧科所羊场和甘肃省甘南州李恰如牧场的藏羊进行免疫试验.[结果]海北州同宝牧场试验点试验组产羔率为110.00％,对照组产羔率为101.14％,试验组比对照组提高产羔率8.86％(P＜0.05);甘肃李恰如试验点试验组产羔率为133.87％,与对照组相比提高产羔率33.87％ (P ＜0.01);海北州牧科所羊场试验点试验组产羔率为125.91％,与对照组相比提高产羔率25.91％ (P ＜0.01).[结论]只要加强藏羊的饲养管理,应用绵山羊双羔素提高藏羊的繁殖率才成为可能.     

Identification of double/twin bolled and bicolor unit ‘cluster’ in <Emphasis Type="Italic">Gossypium hirsutum</Emphasis> L. cotton

Cultivated tetraploid Gossypium hirsutum L. (Malvaceae) cotton has been characterized as having one flower at a primordia. In a strain (CSH-13) of Gossypium hirsutum cotton, four plants out of 103 had two to three double bolls or twin bolls/plant during 2003–2004 crop season at CICR regional station, Sirsa, Haryana, India. Progeny evaluation in 2004 and 2005 crop seasons indicated that plants raised from seeds harvested from double bolls/twin bolls produced plants bearing double bolls only and plant progeny raised from the seed of single bolls from these mutant plants produced two to three double bolls per plant similar to the parent. Progeny testing revealed that double boll formation is the result of spontaneous mutation and environment does not influence its expression. The mutant is early in maturity by 10–15 days, naked seeded and possesses comparable agronomic characters with normal plants. Another spontaneous mutant of Gossypium hirsutum having more than three appendages originating from primordia.: four bolls one leaf, three bolls one leaf, two bolls two leaves, one boll three leaves were obtained from the population of CISV-13 strain in crop season 2003. These appendage groups have been described as bicolor unit by Clemens Bayer, [Zur Infloreszenzmorphologie der Malvales. Dissertations Botany 212 (1994)] and cluster mutant by Russell and Luther [J Cott Sci 6 (2002) 115]. One to three bolls in a cluster or bicolor unit were observed without formation of seeds and lint. About one-third of the total bolls on the mutant plant were of this type. In progeny testing during 2004 and 2005 crop seasons, this mutant produced plants exclusively with more than three appendages revealing that plants identified in 2003 were due to spontaneous mutation. This mutant was also early and naked seeded. Many of the other characters of the mutant plants were comparable with the wild type plants of the strain. Both the mutants were observed having economic impact due to their better yielding ability as compare to respective parents.     

基于现代林业职教集团的“双师型”师资队伍培养模式构建与实践——以福建林业职业技术学院为例

教师是教育发展的第一资源。针对目前高职院校普遍存在的"双师型"师资数量不足问题,根据2019年新出台的《国家职业教育改革实施方案》对"双师型"师资提出了明确的界定:即"同时具备理论教学和实践教学能力的教师",以福建林业职业技术学院为例,基于现代林业职教集团的"双师型"师资队伍培养模式构建与实践,探索以现代林业职教集团为纽带,从学校和行业企业两个层面,分别构筑课堂教学、研修访学、校内实训基地、校企合作产教融合、社会服务等五大平台,通过校内与校外、理论与实践等多管齐下、多措并举,有效促进教师的理论教学能力和实践教学能力提升,为推进"双师型"师资队伍培养探索贡献智慧和方案。     

甘蓝型双低油菜品种"沪油18"的选育

"沪油18"是采用品种间杂交,低世代抗性鉴定和定向筛选育成的高产、抗(耐)菌核病和病毒病、抗倒伏和抗冻甘蓝型双低油菜新品种。该品种种子含油率42%,芥酸含量0.33%,硫苷含量10.16μmol/g。在上海市油菜区域试验中平均产量2 338.5 kg/hm~2,比双低对照"沪油15"增产4.1%。     

大豆磷高效基因GmPHR1和GmPAP4共转化及新种质创制

磷对大豆生长发育至关重要,土壤有效磷缺乏严重影响其产量和品质。目前已有学者通过转基因手段将磷高效相关基因转入大豆,并获得转基因新材料,但多数集中于单基因转化,而双基因共转化研究甚少。本研究在前期获得转磷高效相关基因GmPHR1、GmPAP4大豆新材料基础上,利用农杆菌介导与常规杂交技术进行双基因共转化,结果发现,采用这2种方案均可实现双基因共转化,获得了经PCR及DNA测序分析验证正确的转GmPHR1与GmPAP4双基因新材料“JD12-PHR1-PAP4”。     

双季稻吨粮高产栽培技术试验研究综述

为了集成双季稻吨粮高产栽培配套技术,以便大面积推广应用,对双季稻不同育秧方式、抛插密度、施氮量及氮肥后移技术对水稻产量的影响作试验研究。种植超级稻良种,采用配套无盘育秧、每公顷抛插32万蔸115万苗左右、每公顷施纯N195kg、N:P2O5:K2O=1:0.5:1.2、晚稻氮肥适当后移、补施偏施肥料促进全田平衡生长、水气平衡管理、病虫综合防控等双季稻吨粮高产栽培措施,对提高水稻的产量最为有利,可实现每年每667m2产吨粮目标。     

冬种黑麦草对6种水稻土重金属含量及晚稻不同器官重金属累积与分配的影响

研究双季稻区6种不同土壤类型冬季种植黑麦草对土壤重金属含量及其对晚稻不同器官重金属积累与分配的影响, 可为水稻质量安全生产和产地安全适宜性评价提供重要参考。本文以7年定位试验为基础, 研究了南方双季稻区冬季种植黑麦草对6种不同水稻土耕层土壤重金属Cd、Pd、Hg和As含量的变化及其对晚稻不同器官重金属积累与分配的影响。结果表明, 在6种不同土壤类型中, 灰泥田土壤Cd含量极显著高于其他土壤类型; 黄泥田土壤Pd含量极显著高于其他土壤类型; 土壤Hg含量以红黄泥田最高, 达0.029 mg kg^-1, 与其他土壤类型差异达极显著水平; 土壤As的含量以黄泥田最高, 为29.5 mg kg^-1, 极显著高于其他土壤类型。6种不同土壤类型晚稻植株Cd、Pb、As含量均为根>茎叶>糙米。在晚稻植株根系、茎叶和糙米的Cd含量以红黄泥田最高, 均极显著高于其他土壤类型; 植株根系Pb、As含量以黄泥田最高, 分别为33.0 mg kg^-1和119.5 mg kg^-1, 均极显著高于其他土壤类型; 河沙泥水稻植株茎叶的Hg、As含量均极显著高于其他土壤类型。说明黄泥田种植水稻有利于降低稻米中重金属含量, 改善稻米品质。     

双离合器自动变速器液压阀体强度分析

采用六面体单元对双离合器自动变速器液压阀体进行网格划分,并约束螺栓孔内壁节点,对油道内壁施加均布载荷,通过静力分析获得液压阀体的应力分布及其最大应力,据此对液压阀体强度进行校核,并在强度分析基础上对阀体进行轻量化设计。     

冷浸田双季稻品种和栽培方式比较研究

为了筛选适宜于冷浸田栽培的双季稻品种和高产栽培方式,2009年早晚两季在湖南宁乡县、永兴县和桃源县进行了大田栽培试验,结果表明:(1)双季稻产量及其构成因子品种间差异显著,3地点平均产量早稻以陆两优996最高(5.68 t/hm2),晚稻以天优华占最高(5.61 t/hm2);(2)双季稻不同栽培方式间产量差异显著,3地点平均产量均以垄厢栽培最高,早稻和晚稻分别为5.52 t/hm2和5.81 t/hm2;以传统栽培方式最低,平均产量分别为4.75 t/hm2和5.25 t/hm2。由此可见,选用适宜于冷浸田的双季稻品种,采用垄厢栽培方式有利于获得高产。