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超级杂交稻Y两优1号在湖南祁阳种植表现及高产栽培技术 总被引：5，自引：0，他引：5
Y两忧1号是湖南杂交水稻研究中心育成的超级杂交稻组合,在湖南祁阳县种植,表现出株叶形态好、穗粒结构好、丰产性好、米质优、抗性好等特点.总结了适合祁阳当地的Y两优1号高产栽培技术. 相似文献
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通过油菜—水稻轮作种植,提高复种指数,既能提高土壤地力,又能增加农民收入。介绍了油研9号—深两优5814在浦城种植表现及高产栽培技术。 相似文献
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Y两优7号是湖南杂交水稻研究中心利用Y58S与B163杂交选育而成的超高产杂交水稻新品种,具有高产、稳产、适应性广、抗性较强等特点。介绍了Y两优7号在大田县示范种植表现及其高产栽培技术要点,以期指导该品种的推广种植。 相似文献
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Y两优1号是湖南杂交水稻工程技术研究中心用广适性低温敏两用核不育系Y58S与恢复系9311配组育成的籼型两系杂交水稻新组合.2006年通过湖南省品种审定,2008年通过国家品种审定(国审稻2008001).2008年在松溪县种植表现高产稳产,抗逆性好,适应性广,落色好,叶青籽黄,出米率高,米质优良等特点. 相似文献
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不同生育时期干旱对大豆主要生理参数及产量的影响 总被引：17，自引：5，他引：12
研究了不同生育时期干旱对大豆光合速率、硝酸还原酶活性、磷酸蔗糖合成酶和蔗糖合成酶活性等生理指标的影响以及对产量和产量构成因子的影响.结果表明,不同生育时期进行干旱处理均使光合速率硝酸还原酶活性、蔗糖合成酶活性和磷酸蔗糖合成酶活性降低,光合速率以分枝期到鼓粒期干旱处理降低幅度较大,硝酸还原酶活性以开花期干旱处理降低幅度最大,其次是分枝期和鼓粒期;蔗糖合成酶活性和磷酸蔗糖合成酶活性以开花期干旱处理降低幅度最大,其次是鼓粒期和分枝期;不同生育时期干旱处理均导致大豆产量构成因子和产量下降.每株荚数和每荚粒数以结荚期干旱处理降低幅度最大,其次是鼓粒期干旱处理、开花期干旱处理;百粒重以鼓粒期干旱处理降低幅度最大,其次是结荚期和开花期干旱处理.单株产量以结荚期干旱处理降低幅度最大,其次是鼓粒期、开花期干旱处理.开花期、结荚期和鼓粒期干旱对产量影响最大,在大豆生产中要特别注意这几个生育时期的水分管理. 相似文献
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香蜜杨桃果实不同部位的可溶性固形物含量分析 总被引：1，自引：0，他引：1
2009年7月在三亚市、五指山市香蜜杨桃果园的不同地段、坡向,采集样品果实,测定果实不同部位及全果实的可溶性固形物（TSS）含量。结果表明,同一果实的下端、中部、上端TSS含量差异极显著,中部、全果TSS含量差异不显著。果实下端TSS含量最高,中部次之,上端最低。果棱间、不同果棱中部TSS含量差异圴不显著。对果实中部、全果TSS含量进行线性回归,呈极显著的直线相关。表明果棱中部TSS含量可直接表示全果TSS含量状况。在环境条件和栽培措施等差异下,果实不同部位TSS含量有一致性的显著性差异,果实下端TSS含量最高,中部次之,上端最低。 相似文献
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小麦花后淹水胁迫对根区土温及籽粒灌浆的影响 总被引：3，自引：0，他引：3
为了探讨淹水对花后冬小麦根区土温及籽粒灌浆的影响,在淮北平原涝渍易发地河南商丘市,对处于花后灌浆阶段的冬小麦进行淹水试验。结果表明,淹水使小麦百粒重降低,花后灌浆阶段淹水1 d、3 d和5 d使乳熟期的小麦百粒重比非淹水处理分别降低6.93%、10.35%和10.31%;淹水使小麦灌浆速率受到抑制,淹水5 d、3 d、1 d和CK的平均单粒灌浆速率分别为1.36、1.39、1.52和1.61 mg·d-1,淹水超过5 d使小麦的乳熟时间推后。淹水使10~40 cm土层间温差变小,淹水时间越长,10~40 cm土温降低越多,淹水结束后土温回升也越快。花后淹水使小麦干物质量及籽粒产量降低,淹水5 d以上使小麦地上、地下部分干物质量显著降低。因此,小麦花后灌浆阶段淹水会影响根区环境和地上部干物质的形成,并最终影响籽粒灌浆及产量。 相似文献
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R. JONES 《Grass and Forage Science》1979,34(3):233-236
Oven-drying at 60°, 80° or 105°C was compared with microwave and freeze-drying as a method of preparing samples for the estimation of formononetin, the major oestrogenic factor in red clover. There was no significant difference in the formononetin concentration of clover samples either oven-dried at 60°C or freeze-dried. The formononetin concentration was reduced by drying at higher temperatures and by microwave-drying but was not affected by wilting for up to 8 h after harvesting. The routine determination of formononetin in ten varieties of red clover showed no significant differences between samples cold stored at – 18°C prior to oven-drying at 60°C and samples freeze-dried. 相似文献
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The inhibition by bisulfite of the oxidation of tyrosine in the enzymatic blackening reaction was pH dependent. At a pH of 5.0 or lower, bisulfite was a very effective enzyme inhibitor. A pH higher than 5.0 resulted in much less enzyme inhibition. At a pH of 4.0, the pH alone was a very effective enzyme inhibitor while a pH of 5.0 or above did not inhibit tyrosine oxidation very much. Thus, when bisulfite was present at a pH above 5.0, the main factor inhibiting enzymatic blackening was the bisulfite. Below pH 5.0 the inhibition of the polyphenol oxidase by both bisulfite and pH was important. The inactivation of polyphenol oxidase by bisulfite was a function of time and was pH dependent. Rapid inactivation occurred at pH 4.0 while inactivation occurred much more slowly at pH 5.0, 6.0 and 7.0. The residual enzyme activities were higher at pH 5.0 or above than at pH 4.0. Reactivation of the polyphenol oxidase did not occur over a 7 day period. 相似文献
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Field experiments were conducted on hydromorphic soils at the International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria to determine the effects of crop-management practices on rice yield. The performances of three rice cultivars at different crop densities and weeding regimes were investigated. Weed weight decreased significantly as the interrow spacing was decreased from 45 cm to 15 cm. Tillering and the number of rice panicles also decreased with reduction in interrow spacing. When rice was kept weed free, there was no significant difference in yield between rice planted at 15, 30 and 45 cm interrow spacing. However, when the crop was weeded once only at 30 d.a.s., yield was significantly reduced at the widest spacing. Yield reduction caused by weed competition at the wide interrow spacing was more pronounced in the semi-dwarf cultivar than in the taller cultivars. All cultivars competed better with weeds when grown at 15 and 30 cm interrow spacing than at the wider spacing used by most peasant rice farmers in West Africa. 相似文献
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J. J. J. WILTSHIRE P. D. HEBBLETHWAITE R. E. ESSLEMONT D. A. McGILLOWAY 《Grass and Forage Science》1989,44(2):139-150
Field trials were conducted in 1985 and 1986 to assess the effects of the growth regulator RSW0411 on a Lolium perenne L. (perennial ryegrass) seed crop. Applications were made at spikelet and floret initiation, and at 1, 2, 3 and 4 kg active ingredient ha−1 .
Seed yield increases in 1985 were associated with increased reproductive tiller numbers and seed numbers, but in 1986 there were no seed yield responses.
Lodging was less severe in 1986, and there was less secondary filtering during seed maturation. In 1985, fertile tiller numbers were lower in control plots at harvest. These results are discussed in relation to the seasonal disparity in seed yield response.
RSW0411 application significantly decreased culm lengths by shortening the basal internodes, and this effect was greater with higher application rates. Stem width was increased in 1985 at the base and middle of the stem, and earlier applications increased the basal width by more than later applications.
Germination was not affected by RSW0411 treatment, except when applied at 4 kg active ingredient ha−1 in 1985, when there was a small decrease. This was related to a low 1000-seed weight, and is discussed in relation to seed maturity at harvest. 相似文献
Seed yield increases in 1985 were associated with increased reproductive tiller numbers and seed numbers, but in 1986 there were no seed yield responses.
Lodging was less severe in 1986, and there was less secondary filtering during seed maturation. In 1985, fertile tiller numbers were lower in control plots at harvest. These results are discussed in relation to the seasonal disparity in seed yield response.
RSW0411 application significantly decreased culm lengths by shortening the basal internodes, and this effect was greater with higher application rates. Stem width was increased in 1985 at the base and middle of the stem, and earlier applications increased the basal width by more than later applications.
Germination was not affected by RSW0411 treatment, except when applied at 4 kg active ingredient ha
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XIANG Zu-fen YANG Wen-yu REN Wan-jun WANG Xiao-chun 《水稻科学》2005,12(2):107-113
The effects of uniconazole by soaking seeds and spraying leaves at booting stage with different concentrations （0, 20 and 40 mg/kg） on the nitrogen metabolism of flag leaf and grains after flowering, and rice grain protein content and yield were studied with hybrid rice combination Shanyou 63. Under uniconazole treatment, the soluble protein content in flag leaf was increased in early and middle period of grain filling, but this content was nearly the same as or even lower than that of control at maturity; Glutamine synthetase activity in superior and inferior grains and non-protein nitrogen content in superior grains at early stage of grain development were promoted, and moreover, the transforming speed from non-protein nitrogen to protein nitrogen was accelerated; Non-protein nitrogen content was lower than that of control at maturity, but protein nitrogen content at each stage was higher than those of control; Protein nitrogen content in superior and inferior grains and protein nitrogen absolutely accumulative content in a grain both were enhanced and protein content and yield in rice grain were raised. The application of uniconazole by soaking seeds and spraying leaves raised crude protein content by an average of 7.2% and 8.3%, and protein yield by an average of 13.1% and 13.4%, respectively. 相似文献
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Jose Pablo Soto-AriasGary P. Munkvold 《Crop Protection》2011,30(5):577-580
Fungicides pyraclostrobin (strobilurin) and tebuconazole (triazole) were applied to soybean [Glycine max (L.) Merr.] at growth stages R3, R5 or R3 + R5, in 2008 and 2009 at two locations in Iowa. Incidence of infection of stems and seeds by Phomopsis spp. was evaluated, along with yield and seed quality. Stem infection by Phomopsis spp. was reduced in both years by pyraclostrobin applied at R3 + R5, and in 2008 by pyraclostrobin at R5, by approximately three-fold compared to the untreated control. In 2009, treatments including applications of tebuconazole at R3 and pyraclostrobin at R5 significantly reduced infection of seed by Phomopsis spp., by approximately two-fold compared to the untreated control. Only the application of pyraclostrobin at R3 + R5 reduced both stem and seed infection by Phomopsis spp. in 2009. None of the treatments had a significant effect on yield, or seed quality, evaluated by warm and cold germination tests. Seed infection by Phomopsis spp. was negatively correlated with seed quality. Fungicides applied at these growth stages can have an impact on infection by Phomopsis spp., but their effectiveness varies with environment and disease intensity. 相似文献