共查询到20条相似文献,搜索用时 617 毫秒
1.
玉米6个产量性状与产量的灰色关联度分析 总被引:5,自引:1,他引:5
应用灰色关联度分析法,对玉米12个组合的6个主要数量性状与籽粒产量进行分析.结果表明:玉米单交种的产量与各产量性状关联度的大小顺序为:结实长>百粒重>穗位>株高>生育期>行数.目的是为高产玉米杂交种的选育提供科学依据. 相似文献
2.
3.
4.
5.
12个玉米群体的主要农艺性状与产量、品质的灰色关联度分析 总被引:21,自引:0,他引:21
为了明确玉米群体主要农艺性状与产量、营养品质的关系,应用灰色关联度分析方法对12个玉米群体的主要农艺性状、产量、营养品质等进行了灰色关联度分析。结果表明:与产量密切相关的农艺性状是出籽率、行粒数、穗粗、百粒质量、株高等;与粗蛋白、粗脂肪、粗淀粉和赖氨酸含量等营养品质密切相关的农艺性状是穗粒数、百粒质量、行粒数、出籽率、穗行数等。根据玉米群体主要农艺性状间的灰色关联度关系,说明在玉米群体产量、营养品质改良的过程中,在保证适当株高的前提下,要注重选育出籽率、百粒质量较高品种,同时不要忽略对玉米群体穗行数、行粒数、穗粗的选择,为选育高产、优质玉米新品种提供科学依据。 相似文献
6.
黑龙江西部半干旱地区玉米产量与农艺性状灰色关联度分析 总被引:1,自引:0,他引:1
利用灰色关联度分析方法,对黑龙江省西部半干旱地区13个玉米品种的12个农艺性状与产量进行了分析与评价。结果表明:出籽率(r=0.7389)与产量的关联度最大,其次是单穗粒重(r=0.7199)和行粒数(r=0.7092);关联度最小的是穗位高(r=0.598);其他农艺性状与产量的关联度都介于0.6~0.7之间。说明出籽率、单穗粒重、行粒数对产量的影响最大;穗位高与产量的关系最远,相对于其他性状对玉米产量的影响最小。 相似文献
7.
高产栽培条件下夏玉米穗部性状研究 总被引:1,自引:0,他引:1
本文采用灰色关联分析理论,对16个玉米杂交种穗部性状与产量的关系进行研究。结果表明,在高产栽培条件下,玉米产量与穗部性状的关联度排序为:粒数/m2>千粒重>穗粒数>出籽率>穗行数>行粒数>穗粗>穗数/hm2>穗长>秃尖长。进一步分析表明与高产栽培条件相适应的杂交种是单位面积粒数较多、穗粒数和千粒重较高的中大穗耐密型玉米杂交种,出籽率较高;从玉米的形态性状来看,穗行数和穗粗对产量的影响大于行粒数和穗长对产量的影响。 相似文献
8.
9.
高产栽培条件下夏玉米农艺性状研究 总被引:2,自引:0,他引:2
采用灰色关联分析理论,分析了16个玉米杂交种的农艺性状与产量的关系,结果表明,玉米产量与各农艺性状的关联度排序为:单位面积粒数>灌浆期(d)>灌浆期占总生育期的比>千粒重>穗粒数>生育期(d)>株高>叶片数>成熟时绿叶数>单位面积穗数>单位面积根条数>最长根.进一步分析表明,与高产栽培条件相适应的杂交种是单位面积粒数较多、穗粒数和千粒重较高的中大穗耐密型玉米杂交种;在植株形态性状适合程度上首先表现在有一定的株高和叶片数、根条数;在生育期上灌浆时间的长短对产量的影响最大,因此获得高产应选用生育期较长、灌浆时间占全生育期50%以上的杂交种. 相似文献
10.
11.
宁春50号是宁夏农林科学院农作物研究所育成的高产优质广适小麦新品种,用品种鉴定、品比试验、区试试验、生产试验以及大面积生产示范、农田生产等多年多点试验示范对该品种进行了产量形成及稳定性分析,以期为当前高产小麦育种栽培提供借鉴.结果表明,宁春50号较对照宁春4号表现出了较高的产量;宁春50号稳定性与宁春4号相当,在2007年区试中宁春50号丰产稳产性都高于宁春4号,在稳定性产量上还有提高的潜力;在不同区域条件下,宁春50号和宁春4号产量及产量构成变化幅度基本一致,变化幅度最大的为穗粒数,千粒重次之,穗数最低;宁春50号产量及产量构成平均值较宁春4号都高,表明宁春50号具有较好的遗传特性,增产潜力明显;产量达到8 000 kg/hm2以上,平均穗数达到669.8×10 4穗/hm2,平均穗粒数为30.9粒/穗,千粒重为42.8 g,在5 000 kg/hm2到1 000 kg/hm2产量水平变化过程中,穗数、千粒重都呈现明显的递增趋势,而穗粒数变化趋势不明显;宁春50号产量增加与穗数、千粒重关系密切,相关系数分别为0.37、0.34,达到了极显著水平,与稳粒数关系未达到显著水平.宁春50号增产要提高穗数和千粒重,并采取相应的栽培管理措施. 相似文献
12.
干旱胁迫时期对水稻产量及产量性状的影响 总被引:2,自引:0,他引:2
为了明确干旱胁迫对水稻产量及产量性状的影响,以粳稻品种农大3号为材料,利用盆栽的方式人工控制土壤水分(水势),研究了不同生育阶段干旱胁迫对产量及产量性状的影响。结果表明:任何时期干旱胁迫都会导致减产,孕穗中期、后期减产幅度最大,其次是分蘖中期、前期。分蘖后期(无效分蘖期)干旱虽然穗粒数有所增加,但是祢补不了由于穗数下降造成的产量损失,出穗前各阶段干旱胁迫的减产幅度大于出穗后各阶段。分蘖期干旱使单穴有效穗数减少,孕穗期干旱穗粒数减少;孕穗期、产量形成期(出穗—乳熟期)干旱千粒重、成熟粒率降低;孕穗中期干旱结实率下降,混合千粒重降低。干旱胁迫条件下,提高单穗平均粒数和混合千粒重有助于提高产量,提高饱满千粒重和混合千粒重有助于提高成熟粒率。 相似文献
13.
14.
15.
Soybean [Glycine max (L.) Merr.] plant density for maximum yield in Japan is usually from 16 to 25 plants m−2 . The objective of this study was to compare yield and yield components, especially node number between square- and zigzag- (an equilateral triangle-planting pattern or plants in the row offset from each other) planting patterns within a range of plant populations (16, 20 and 25 plants m−2 ).
Field experiments with cultivar Enrei (Maturity Group VII) were conducted in the field at Niigata University on a loamy sand soil in 1991, 1992 and 1993.
Yield increased as density decreased in 1991 and as density increased in 1992 and 1993. This result seemed to be due to adverse weather conditions during seed filling in 1991. Yield tended to be higher in zigzag- than in square-planting patterns except at 20 plants m−2 . Seed number m−2 due to increased yield was highly correlated with branch node number. The yield increase was caused by an increase in total node number, especially branch node number m−2 (about 60 % contribution at 16 plants m−2 and about 40 % contribution at 25 plants m−2 ). 相似文献
Field experiments with cultivar Enrei (Maturity Group VII) were conducted in the field at Niigata University on a loamy sand soil in 1991, 1992 and 1993.
Yield increased as density decreased in 1991 and as density increased in 1992 and 1993. This result seemed to be due to adverse weather conditions during seed filling in 1991. Yield tended to be higher in zigzag- than in square-planting patterns except at 20 plants m
16.
Useful light interception during reproductive stages is very important for soybean ( Glycine max (L.) Merr.) dry matter production. The objective of this experiment was to investigate the light utilization in the canopy for yield, and its components in the case of arranging branch direction to row direction with flat type (1/2 phyllotaxy) soybean. The field study was conducted in the field at Niigata University on a loamy sand soil at 25, 16 and 9 plants m−2 in 1994, 1995 and 1996, using cultivar 'Miyagishirome' (Maturity Group VII or VIII, phyllotaxy 1/2; branches develop flatly) with treatments so that branches developed at right angles direction (Type R) and in a parallel direction (Type P) to the direction of the row.
Total dry weight (TDW) was greater in Type R than in Type P. A higher leaf area index (LAI) was shown in Type R than in Type P in each plant density among the three years. More light penetrated into the canopy in Type R than in Type P. Higher TDW and LAI were produced by effective light interception at the canopy of Type R.
Yield and its components were greater in higher than lower density and tended to be greater in Type R than in Type P. Increased yield depend on seed, pod and node number m−2 . The increase of yield components in Type R was suggested to be due to favorable light condition in the canopy, compared with Type P. 相似文献
Total dry weight (TDW) was greater in Type R than in Type P. A higher leaf area index (LAI) was shown in Type R than in Type P in each plant density among the three years. More light penetrated into the canopy in Type R than in Type P. Higher TDW and LAI were produced by effective light interception at the canopy of Type R.
Yield and its components were greater in higher than lower density and tended to be greater in Type R than in Type P. Increased yield depend on seed, pod and node number m
17.
18.
GS豫麦21号的丰产,稳产性及产量结构分析 总被引:6,自引:0,他引:6
利用黄淮南片水地小麦良种区试和河南省区试、生产示范资料,对GS豫麦21号的丰产性、稳产性和产量结构进行分析。结呆在明:GS豫麦21号具有丰产稳产性好、适应性广、产量构成三要素协调等优良特性,在产量构成三要素中,千粒重对产量的直接作用最大,穗粒数次之,有效穗数的直接作用最小,因此在高产栽培上应在兼顾667m2成穗(40万上下)的基础上,主攻千粒重和穗粒数的增加。 相似文献
19.
大豆产量和产量构成因子及倒伏性的QTL分析 总被引:6,自引:3,他引:3
随机选取中豆29×中豆32重组自交系群体中165个家系作为2年田间试验材料,分析大豆单株产量、产量构成因子及倒伏性等性状的相关性和遗传效应,并检测各性状QTL。结果表明,38个与产量、产量构成因子及倒伏性状等有关的QTL,主要集中在C2、F和I连锁群。表型相关分析结果与QTL定位结果一致。在F连锁群上,2年均检测到倒伏QTL qLD-15-1,解释的表型变异超过20%,与百粒重和分枝荚数QTL分别位于相同和相邻标记区间,表明产量相关性状与倒伏性存在一定的关联。在I连锁群上,每荚粒数QTL和二、三、四粒荚数QTL不仅于同一位置,解释的表型变异为32%~65%,并且2个年份均重复出现,每荚粒数和四粒荚数QTL与二、三粒荚数QTL的增效基因分别来自不同的亲本。这4个粒荚性状QTL的共位性与表型相关分析结果一致,证实每荚粒数和四粒荚数与二、三粒荚数分别由不同的机制调控,对于育种上探讨以改良大豆粒荚性状为途径提高大豆产量,提供了重要依据。 相似文献
20.