共查询到19条相似文献，搜索用时 109 毫秒
1.
水稻抛栽立苗影响因素试验与分析 总被引：1，自引：0，他引：1
2004年早稻利用汕优016,设置不同水层深度抛栽、不同秧苗高度抛栽、不同秧苗带蘖数抛栽、不同苗龄抛栽等4个试验,研究塑盘育秧抛后育苗技术,结果表明:塑盘育秧抛栽适宜水层1~5 cm,抛栽最佳苗高15~18 cm,秧苗带蘖越多,立苗速度越快,苗龄越小,立苗时间越短. 相似文献
2.
杨安中 《安徽科技学院学报》2004,18(1):39-41
本文研究了旱育、包衣旱育和湿润育秧三种不同育秧方式对水稻秧苗素质及抗逆性的影响.结果表明,包衣旱育出苗率、成秧率高,秧苗素质好,抗逆性强,是一种值得推广的新的育秧方式. 相似文献
3.
采用密度、肥料二因素不同处理水平裂区设计试验,对后季稻旱育抛栽种植方式在不同密度和不同施肥水平条件下茎蘖动态、叶面积变化、干物质积累、光合势、光合生产率、穗粒结构、产量表现及其抗逆性进行研究,探明不同密度和施肥水平对群体质量和产量的影响,以期为制定其高产栽培技术措施提供理论依据. 相似文献
4.
杨安中 《安徽技术师范学院学报》2004,18(1):39-41
本文研究了旱育、包衣旱育和湿润育秧三种不同育秧方式对水稻秧苗素质及抗逆性的影响。结果表明，包衣旱育出苗率、成秧率高，秧苗素质好，抗逆性强，是一种值得推广的新的育秧方式。 相似文献
5.
旋转式水稻钵体带土苗抛栽机的设计研究 总被引：1，自引：0，他引：1
为适应新一代水稻育秧播种机械发展的要求,研制了2ZPZ-4型旋转式水稻钵体带土苗抛栽机,介绍了该机的工作原理、基本结构和主要创新点,经试验并得出结论:能适应水稻钵体带土苗抛栽,提高抛秧栽培的均匀度。 相似文献
6.
戴忠青 《安徽科技学院学报》2001,(3)
:65 0 0 2作为杂交中稻进行旱育抛栽时 ,以秧龄在 2 5d左右 ,抛栽密度 17株 /m2 ,纯N施用量 180kg/hm2 ,N肥运筹以基肥∶蘖肥∶穗肥 =7∶1∶2为宜 ,考虑到 65 0 0 2灌浆期长 ,扬花期前后各要防治一次稻曲病 相似文献
7.
旱糯稻不同育秧方式的试验 总被引：1，自引：0，他引：1
为探索旱糯稻的最佳育秧方式,作者对旱糯稻的旱育秧及水田湿润育秧进行了对比试验。试验发现,旱育秧秧苗矮健,分蘖多、根多、成活快;且有效穗多,成穗率和结实率均高于湿润育秧;千粒重略有增加。 相似文献
8.
翁俊基 《闽西职业技术学院学报》2000,(3)
湿润育秧、旱育秧、塑料软盘育秧施用壮秧肥，比对照出苗率高、生长快、分蘖多、根系发达、干物质积累多，同时能减轻秧苗绵腐病、立枯病的危害，水稻增产 8.3％。试验结果表明；壮秧肥的适宜用量为湿润育秧 60g/m2，旱育秧 75g/m2，塑料软盘育秧 125g/10片。 相似文献
9.
翁俊基 《闽西职业大学学报》2000,(3):49-49
湿润育秧、旱育秧、塑料软盘育秧施用壮秧肥，比对照出苗率高、生长快、分蘖多、根系发达、干物质积累多，同时能减轻秧苗绵腐病、立枯病的危害，水稻增产8．3％。试验结果表明；壮秧肥的适宜用量为湿润育秧60g/m^2,旱育秧75g/m^2，塑料软盘育秧125g/10片。 相似文献
10.
本文报道了湿润育秧、塑料软盘育秧、旱育秧三种育秧方法培育的秧苗素质及育秧成本的差异.结果表明:旱育秧培育的秧苗素质最好,而育秧成本最低. 相似文献
11.
Yong-qi HE Jin-ping CHENG Liang-feng LIU Xiao-dan LI Bin YANG Hong-sheng ZHANG Zhou-fei WANG 《Journal of Zhejiang University. Science. B》2015,16(10):813-823
Pre-harvest desiccation may increase the efficiency of seed production. Field studies were conducted to determine the effects of diquat, paraquat, and ethephon applications on grain moisture, grain weight, and seed germination of hybrid rice Yanliangyou 88 (Oryza sativa ssp. indica) and conventional rice Wuyunjing 7 (Oryza sativa ssp. japonica). In 2013, we tested 12 treatments applied at four weeks (Yanliangyou 88) and six weeks (Wuyunjing 7) after heading. Results showed that reductions in moisture content were significant two and four days after chemical application. Chemical applications had no adverse effects on 1000-grain weight, germination percentage, or germination index, but there were negative effects on the percentage of normal seedlings. Desiccation effects increased with increase in the period after application, while the effect of ethephon combined with diquat or paraquat on desiccation was limited compared with that of diquat or paraquat alone in a short period after application. In 2013, chemical applications reduced the moisture content by from 0.5% to 6.4%, the germination percentage by from 0% to 3.3%, and the percentage of normal seedlings by from 13.3% to 100.0%. Among the treatments, diquat applied at 120 g/ha resulted in effective desiccation with fewer negative effects on grain weight and seed germination in 2013 and 2014. Therefore, diquat may have potential as a pre-harvest chemical desiccation treatment for rice. These results may provide a basis for developing and implementing protocols for large scale field trials. 相似文献
12.
Studies were initiated for two consecutive years to find out the effect of time of transplanting and seedlings hill^-l on the productivity of rice in Dera Ismail Khan district of North West Frontier Province （NWFP）, Pakistan. The experiment was laid out in a randomized complete block design with split plot arrangements. Main plots consisted of four transplanting dates viz. 20th and 27th of June and 4th and 1 lth of July while sub-plots contained 1, 2, 3 or 4 seedlings hill^-1. Among transplanting dates, June 20th planted crop gave highest paddy yield and net return with I seedling hill^-1. It explains that the use of more seedlings hill^-1 not only adds to cost but is also a mere wastage of natural resources. Based on research findings, we conclude that the use of I seedling hill^-1 is most appropriate for timely sowing otherwise 4 seedlings hill^-1 should be used to compensate for the yield gap in late transplanted rice. 相似文献
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14.
Effect of seedling age and water depth on morphological and physiological aspects of transplanted rice under high temperature 总被引：2，自引：0，他引：2
Khakwani AA Shiraishi M Zubair M Baloch MS Naveed K Awan I 《Journal of Zhejiang University. Science. B》2005,6(5):389-395
INTRODUCTION Rice (Oryza sativa L.) is one of the most im-portant crops in Pakistan. It is the third largest crop interms of area and production after wheat and cotton.Although rice in Pakistan is consuming large acreage,Pakistan is still far behind other rice producingcountries. The average yield is very low (2 t/ha) ascompared to Egypt (8.4 t/ha) and USA (6.6 t/ha).There are many reasons for this low yield. The mostimportant are high temperature (40?50 °C), low hu-midity at … 相似文献
15.
Fu-min Wang Jing-feng Huang Qi-fa Zhou Xiu-zhen Wang 《Journal of Zhejiang University. Science. B》2008,9(12):953-963
The objectives of the study were to select suitable wavebands for rice leaf area index (LAI) estimation using the data acquired over a whole growing season, and to test the efficiency of the selected wavebands by comparing them with feature positions of rice canopy spectra. In this study, the field experiment in 2002 growing season was conducted at the experimental farm of Zhejiang University, Hangzhou, China. Measurements of hyperspectral reflectance (350-2500 nm) and corresponding LAI were made for a paddy rice canopy throughout the growing season. And three methods were employed to identify the optimal wavebands for paddy rice LAI estimation: correlation coefficient-based method, vegetation index-based method, and stepwise regression method. This research selected 15 wavebands in the region of 350-2500 nm, which appeared to be the optimal wavebands for the paddy rice LAI estimation. Of the selected wavebands, the most frequently occurring wavebands were centered around 554, 675, 723, and 1633 nm. They were followed by 444, 524, 576, 594, 804, 849, 974, 1074, 1219, 1510, and 2194 nm. Most of them made physical sense and had their counterparts in spectral known feature positions, which indicates the promising potential of the 15 selected wavebands for the retrieval of paddy rice LAI. 相似文献
16.
水稻插秧机后插式分插机构研究 总被引：2，自引：0，他引：2
陈德俊 《金华职业技术学院学报》2001,1(4):1-3
本文用计算机对水稻插秧机后插式分插机构进行了分析研究。通过秧针端点运动轨迹上的6个特定点，分析了后插式分插机构的运动学和动力学。经理论分析和田间试验表明，后插式分插机构的结构参数选择是合理的，插秧性能是优良的。 相似文献
17.
高银桥 《黄冈职业技术学院学报》2010,12(5):105-108
水稻是黄冈种植面积最大的传统优势主导产业,现已建设成为全国重要的优质粮油基地,但其种植环节的机械化发展较慢,成为水稻生产全程机械化最突出、最薄弱的环节,如何提高水稻综合生产能力,是黄冈市县各级农机管理、推广部门一直以来不断研究、探索、寻求解决的重点和难点。为此,文章以基层调查资料为依据,对大力推进黄冈水稻种植机械化技术进行了利弊分析,并提出了加快机插技术推广的若干措施与建议。 相似文献
18.
用 5 0mg/L水杨酸 (SA)浸种处理后 ,水稻根系生长受到明显促进。幼苗经 5 0mg/LSA诱导处理 2 4h后 ,体内的硝酸还原酶活性 (NRA)显著增强。与此相一致的是 ,5 0mg/LSA处理不仅能提高幼苗内源细胞分裂素和生长素的水平 ,还可以降低脱落酸的含量。提示SA对硝酸还原酶活性的诱导作用可能是通过调节内源激素的水平来实现的。 相似文献
19.
Analyses of the correlation between hyperspectral reflectance and pigment content including chlorophyll-a, chlorophyll-b and carotenoid of leaves in different sites of rice were reported in this paper. The hyperspectral reflectance of late rice during the whole growing season was measured using a Spectroradiometer with spectral range of 350-1050 nm and resolution of 3 nm. The chlorophyll-a, chlorophyll-b and carotenoid contents in rice leaves in rice fields to which different levels of nitrogen were applied were measured. The chlorophyll-a content of upper leaves was well correlated with the spectral variables. However, the correlation between both chlorophyll-b and caroteniod and the spectral variables was far from that of chlorophyll-a. The potential of hyperspectral reflectance measurement for estimating chlorophyll-a of upper leaves was evaluated using univariate correlation and multivariate regression analysis methods with different types of predictors. This study showed that the most suitable estimated model of chlorophyll-a of upper leaves was obtained by using some hyperspectral variables such as SDr, SDb and their integration. 相似文献