大银鱼卵细胞粘丝扫描电镜观察   总被引：1，自引：0，他引：1  

龚世园  梁开学 《华中农业大学学报》1996,15(6):580-583,T002

用扫描电镜观察了大银鱼的第Ⅲ时相，第Ⅳ时相，第Ⅴ时相卵母细胞和受精卵的卵细胞粘丝的外部形态特征和它们的粘性，并讨论了卵细胞粘丝的功能。  相似文献   

Effects of heat treatment on the properties of bamboo scrimber     

Weiwei Shangguan  Yingchun Gong  Rongjun Zhao  Haiqing Ren 《Journal of Wood Science》2016,62(5):383-391

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Identification of embryonic stem cell activities in an embryonic cell line derived from marine medaka (Oryzias dancena)     

Dongwook Lee  Jun Hyung Ryu  Seung Tae Lee  Yoon Kwon Nam  Dong Soo Kim  Seung Pyo Gong 《Fish physiology and biochemistry》2015,41(6):1569-1576

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烤烟烘烤技术现状与发展趋势   总被引：8，自引：0，他引：8  

宋朝鹏  李富欣  陈少斌  樊军辉  宫长荣 《作物杂志》2010,(1)

烘烤是烟叶生产的重要技术环节。本文针对我国烤烟烘烤技术现状,分析了当前存在的问题,展望了今后的发展方向,指出烘烤技术要实现精准控制,彰显特色烟叶的本质风格。要因地制宜实现烘烤环节的机械化。要重视节能降耗,使用清洁能源。统一烤房设备标准、完善技术规范,为现代烟草农业和专业化烘烤的发展奠定理论基础。  相似文献   

Development and characterization of microsatellite markers for caladiums (Caladium Vent.)     

LI Gong  Zhanao Deng 《Plant Breeding》2011,130(5):591-595

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安徽沿江地区油麦后直播棉的品种选用策略     

王晓光  刘效明  龚金河  刘满来  张飞  周晓箭 《棉花科学》2021,43(2):51-53,57

在目前安徽沿江地区不能实现棉花机采的情况下,提出了“植株高度既适于机采也适于人工采收,含絮力适中(不易落花便于集中采收),生育期适中(播种到采收为180天左右),纤维品质及产量性状较优(纤维长度30.0 mm以上,断裂比强度30.0 cN/tex以上,马克隆值5.0以下,籽棉产量3750 kg/hm 2以上,衣分在40%左右)”的油(或麦)后直播棉模式的人工采收品种选用策略。旨在促进安徽沿江地区棉花生产稳定发展。  相似文献   

饲料加工中水分在线控制系统研究进展     

钱顺华  江苏华  巩江 《饲料工业》2010,31(11)

水分在线控制系统可实时准确检测饲料的水分,并能保证使饲料的水分在国家规定的范围内,且能满足用户的要求。主要的方法是在待制粒仓内检测待制粒料的实时水分,在冷却器排料口检测成品饲料的实时水分;待制粒料的水分是为调质器加水作依据,而成品水分是保证饲料品质的依据。成品水分偏高,可通过控制冷却器风量来降低,水分偏低,又为调质器加水作参考。本系统通过在几个饲料厂的实际应用,证明完全符合设计要求。  相似文献   

探析IPv6技术     

秦工  邹丽 《农业网络信息》2010,(12)

阐述了IPv4现存在的一些问题和IPv6的一些优点,在此基础上对IPv6、DNS进行简单的介绍。  相似文献   

Agronomic performance of late-season rice under different tillage,straw, and nitrogen management     

Youzun Xu  Lixiao Nie  Roland J. Buresh  Jianliang Huang  Kehui Cui  Bo Xu  Weihua Gong  Shaobing Peng 《Field Crops Research》2010,115(1):79-84

In double rice-cropping system in China, zero tillage in late-season rice with straw return from early season rice is an emerging technology for saving inputs, shortening the lag time between rice crops, avoiding straw burning, and conserving natural resources. The objective of this 2-year field study was to determine the effects of tillage and straw return on N uptake, grain yield, and N use efficiency of late-season rice. Treatments were arranged in a split-plot design with four combinations of tillage and straw return as main plots and three N management practices as subplots. Tillage was either conventional soil puddling or zero tillage with newly harvested crop residue from early season rice either removed or placed on the soil surface without incorporation. The N treatments were zero-N control, site-specific N management (SSNM), and farmers’ N-fertilizer practice (FFP). Straw return regardless of tillage or N management did not reduce rice yield. In the second year, straw return significantly increased grain yield in the zero-N control. Chlorophyll meter readings at heading and total N uptake at maturity were higher with straw return in the zero-N control, suggesting that straw provides nutrients to rice in the late growing period. Zero tillage did not reduce N uptake, grain yield, and N use efficiency compared with conventional tillage. Despite large differences in timing and rate of N application between FFP and SSNM, these two N treatments resulted in comparable N uptake and grain yield of late-season rice regardless of tillage and straw return. These results suggest that zero tillage after early rice with straw return could replace conventional tillage for late rice in the double rice-cropping system in China.  相似文献   

Evergreen broad-leaved forest improves soil water status compared with tea tree plantation in Ailao Mountains,Southwest China     

Hede Gong  Yiping Zhang  Yuhong Liu  Guoping Yang  Zhiyun Lu 《Acta Agriculturae Scandinavica, Section B - Plant Soil Science》2013,63(4):384-388

Abstract

In this paper, the spatial-temporal dynamics of soil moisture content was investigated in an evergreen broad-leaved forest and a tea tree plantation in Ailao Mountains, which was dominated by Fagaceae (Castanopsis wattii and Lithocarpus xylocarpus). Soil moisture content was studied between January 2005 and December 2006 at different depths (from 0–150 cm) with a neutron probe. The results showed that mean soil moisture content in the evergreen broad-leaved forest was usually higher than in the tea tree plantation in the dry season, whereas it was lower than the tea tree plantation in the rainy season. In addition, mean soil moisture content was depth dependent, and in the 10–50 cm layer the spatial variability was due to the active root zone within this depth area in two types of land use. From 50–150 cm, the spatial variability was slightly increasing in the evergreen broad-leaved forest or relatively stable in the tea tree plantation. Our study also showed that soil moisture content was higher and more stable under the evergreen broad-leaved forest than the tea tree plantation, hence we stress that evergreen broad-leaved forest plays an important role in holding soil moisture. It is suggested that the protection of evergreen broad-leaved forest should be strengthened.  相似文献