高抗TYLCV番茄新品种钻红1号的选育

钻红1号是以TM001a为母本,以TM012F为父本配制而成的番茄一代杂种。中早熟,无限生长型,果实近圆形,成熟果大红色,单果质量200g左右,果实横径7.2cm,纵径5.4cm,耐贮运,商品性好。鲜食风味佳,可溶性固形物含量5.82%,有机酸0.401%,总糖4.21%,VC312.1mg·kg-1(FW)。每667m2产量6500kg左右。高抗番茄黄化曲叶病毒病(TYLCV),抗青枯病、叶霉病。适合我国南北方保护地及露地种植。     

辣椒新品种苏椒27号的选育

苏椒27号是以羊角椒自交系09Q37为母本、以甜椒自交系G09005为父本配制的一代杂种。中熟,始花节位为第12节,果实牛角形,长19.0 cm,果肩宽4.8 cm,果肉厚度0.37 cm,单果质量95.2 g,果表光滑,青熟果浅绿色,辣味淡,质脆,商品性好。每667 m2产量约3 850 kg,适于长江中下游地区春季保护地栽培。     

抗TY红果番茄新品种长丰10号的选育

番茄新品种长丰10号是以R025自交系为母本,以R018自交系为父本于2011年配制的杂交一代良种。无限生长红果类型,生长势强,叶片较大,中早熟。坐果率高,连续结果能力强,平均每667 m2产量7 600 kg左右。萼片基平,果实高圆形,果柄短,无绿色果肩,果脐小,表面光滑,外形美观。果实硬度好,耐贮运,货架寿命长,单果质量200 g左右,大小均匀。可溶性固形物含量5.7%,总糖3.34%,总酸0.335%。含有Ty-1、Ty-3基因,抗番茄黄化曲叶病毒病(抗TY)。适宜在陕西省及同等生态区日光温室和塑料大棚栽培。     

甜糯玉米新品种甜香糯9号的选育

鲜食型甜糯玉米新品种甜香糯9号是由RDE007B为母本,EZ-20为父本组配而成的单交种,适宜种植区域广泛,适口性好。春播全生育期106 d(天),中抗丝黑穗病和茎基腐病,高抗瘤黑粉病。株高238 cm,穗位高102 cm,成株叶片数16片。花丝淡绿色,果穗锥形,穗长20.2 cm,穗行数15.2行,行粒数38.6粒,穗轴白色,籽粒白色、马牙型,百粒重38.8 g。平均每667 m2可产鲜穗1 000 kg左右,丰产稳产性好。可在甘肃、新疆、西藏、青海、宁夏、内蒙古、陕西等同类型鲜食玉米生产区域种植。     

不同种植密度对泡渍豇豆成豇9号产量及效益的影响

为加快泡渍豇豆专用品种推广,实现节本增效栽培,以成豇9号为试验材料,研究3种不同种植密度与生产常规密度对豇豆农艺性状、产量与效益的影响。结果表明:随着密度加大,生长势强的处理叶片随之加大,产量反而降低、病虫害增加、成本加大;处理3(每667 m~2种植9 000株,1 800穴,行穴距170 cm×45 cm)的产量、产值最高;处理1(每667 m~2种植9 000株,1 500穴,行穴距170 cm×50 cm)成本最低,产量较高。综合分析,处理1最适宜成豇9号栽培,节本增效,综合比较效益最优。     

大豆叶形垂直分布类型在产量改良中的应用

对油８９３０６组合分离世代的研究表明,该组合存在３种叶形垂直分布类型,即下阔叶—上阔叶、下阔叶—上窄叶和下窄叶—上窄叶。以下阔叶—上阔叶和下阔叶—上窄叶类型的百粒重最大,且两类型间无明显差异,但显著高于下窄叶—上窄叶类型的百粒重;以下窄叶—上窄叶类型的每荚粒数最多,下阔叶—上阔叶类型的每荚粒数最少。在本研究所处旱涝频繁的黄淮南部地区,以下阔叶—上窄叶类型的育种效果最好,并从本类型的研究材料中成功地选育出高产夏大豆新品种中豆２６。与下阔叶—上阔叶类型的中豆１９（８９３０６组合的母本）相比,下阔叶—上窄叶的材料中豆２６和中豆２０实现了在保持其它产量因素变化很小前提下每荚粒数的定向显著提高,因而实现产量的改良。     

玉米杂交种陕资1号的选育及产量稳定性分析

陕资１号是用自选玉米自交系８９-１和Ｋ(１２)杂交选育而成。该杂交种具有高产、优质、多抗、适应性广等特点,籽粒产量一般为 ８．２５ ｔ／ｈｍ２,高产田块达１２．００ ｔ／ｈｍ２。通过对多年多点区域性试验产量结果进行稳定件分析,变异系数ｃｖ＝２５．４０,稳定性参数ｂ＝０．８７６,Ｓ２ｄＩ=０.１９３６,结果表明,陕资１号属高产稳产型品种。     

Temporal dynamics of soil nitrate-N after termination of forage phases in corn-forage rotation

 Efficient N-fertiliser management during the corn (Zea mays L.) phase in corn-forage rotation requires information on temporal dynamics of N release from forage biomass. The influence of forage phase, in corn-forage rotation, and no- versus conventional-till on (1) in situ temporal dynamics of soil nitrate-N (NO₃-N) during corn phase and (2) corn grain yield was investigated in this study. The data used were collected from a crop rotation (corn-forage) experiment, with superimposed tillage treatments, established on a silt loam soil in 1988 and continued until 1994. The cropping treatments were continuous conventionally cultivated (CT) corn, rotations involving corn and forages (alfalfa, Medicago sativa L.; and bromegrass, Bromus inermis L.) and continuous minimally tilled corn with under-seeded red clover (Trifolium pratense L.). The forages were grown for 6 years and corn was re-introduced in these plots under no- and conventional-till systems. Soil NO₃-N in the top 30 cm depth, determined six times during the corn phase, was significantly influenced by previous forage species and tillage system. Regression analysis indicated soil NO₃-N under continuous CT corn did not show significant temporal changes. In the rotations, soil NO₃-N after tillage or herbicide treatment, i.e. in no-till, increased with time until 45 days after tillage (DAT), reached a plateau between 45 and 65 DAT, and then decreased with time. During the plateau, soil NO₃-N in rotation plots ranged from 17 to 33 mg kg^–1 compared to 15.7 mg kg^–1 in the continuous CT corn. Tillage increased soil NO₃-N concentration in alfalfa plots whereas an opposite trend existed in the bromegrass plots. Soil NO₃-N in the rotation plots increased at rates ranging from 0.71 to 1.63 mg kg^–1 day^–1. The interaction involving forage species and the temporal dynamics of soil NO₃-N accounted for 68–77% of variability in corn grain yield. Received: 14 July 1998     

节瓜新品种翠玉2号的选育

翠玉2号是以mb1202-2-1-1为母本、fb1306-2为父本配制的杂种1代绿肉节瓜新品种,为江心类节瓜.生育期露地栽培从播种至始收春季70 d、秋季53 d,延续采收期春季35 d、秋季33 d,第1朵雌花着生节位11.5～12.2节,第1果坐果节位12.7～14.2节.商品果圆筒形,皮色青绿无棱沟,单果质量58...     

杂交青虾“太湖1号”抱卵量与体长、体重的关系

测量了杂交青虾"太湖1号"抱卵虾的体长、体重,同时对其抱卵量进行计数,分析得出,杂交青虾"太湖1号"的抱卵量(F)与体长(L)、体重(W)的关系分别为:F=166.11 e0.0498L(相关系数r=0.9277)、F=896.15 W0.8184(相关系数r=0.9284)。