静海县西瓜设施栽培的演变与实践

通过对静海县西瓜栽培方式演变的分析,论述了不同生产方式下西瓜栽培特点,阐述了设施栽培对西瓜产量、种植效益的影响和对农业增效、农民增收的作用。     

设施草莓蜜蜂授粉技术

为提高温室草莓的产量和质量,介绍提高其座果率的措施。根据我国北方地区设施草莓生产的实际情况,探讨蜜蜂授粉技术的施用要点,以期为草莓种植提供科学的参考。     

Physical and Chemical Properties of Substrates to Cultivate Seedling of Citrus Rootstocks

Abstract

An experiment was carried out to assess the physical and chemical evolution of three substrates and their relation to the vegetative development of seedlings of citrus rootstock, cultivated in containers. The experiment was carried out in greenhouse conditions on 27 September 2001 and continued until 120 days after sowing. The experimental design was randomized block in a split‐plot scheme. In the plots, there were tested substrates: two of them were specialized for horticulture (commercial 1 and 2) and a mixture (turf plus carbonized rice husk). In the subplots, there were four citrus rootstocks (Trifoliate orange, “C13” Citrange, “C37” Citrange, and “Rangpur” Lime). The main results showed that the physical characteristic of the substrate that had undergone the most modification during cultivation was the remnant water; the chemical characteristics of the substrate were determined for the proper development of the rootstocks, with high salinity being harmful. The nutrient availability, before and after cultivation, must be adjusted to the capacity of each of the citrus rootstock to absorb.     

Seedling pot-raising and transplanting technique of maize under greenhouse condition

保苗难、产量低、品质差、效益低是制约青冈县玉米产业发展的主要因素之一,该文综述青冈县玉米的生长条件,提出利用玉米大棚钵体育苗移栽技术解决玉米生产中的制约因素。     

草莓大果品种童子1号特性及丰产栽培技术

介绍了童子1号草莓的生物学特性、物候期和果实特性,并论述了在保护地条件下的丰产栽培技术。     

火龙果北方日光温室栽培存在问题及解决对策

对火龙果在北方日光温室栽培条件下,在品种选择、种苗、栽培技术、产品增值等方面存在的问题进行了全面分析研究,并有针对性地提出了相应的解决对策,旨在促进火龙果北方日光温室栽培的健康发展。     

日光温室管网化灌溉自动施肥系统的设计与应用

依据流体动力学原理，利用日光温室管网灌溉的静压能和文丘里管的特性，设计出在日光温室正常灌溉情况下的自动施肥系统。该系统设施简单，可操作性强，适于中等生产水平的日光温室蔬菜生产区应用。     

日光温室越冬茬黄瓜播期对雌花数量的影响

试验研究了日光温室越冬茬黄瓜播期对雌花数量的影响，结果表明，从9月17日-10月6日分期播种，播种时间越晚，前l-12节平均单节雌花数越多，13-20节差异不明显。日光温室栽培黄瓜，周期性座果现象依然十分明显。     

Nitrous oxide dynamics during denitrification along a hydrological gradient of subtropical grasslands

Nitrous oxide (N₂O) dynamics during denitrification, including N₂O production and reduction, particularly as related to soil depth, are poorly understood. The objective of this study was to investigate the rates of N₂O production and reduction processes at various soil depths along a hydrological gradient in grazed subtropical grasslands. A batch incubation study was conducted on soils collected along a hydrological gradient representing isolated wetland (Center), transient edge (Edge) and pasture upland (Upland) in south-central Florida. Significantly different N₂O production and reduction rates between hydrological zones were observed for surface soils (0–10 cm) under ambient conditions, with average N₂O production rates of 0.368, 0.178 and 0.003 N₂O-N kg⁻¹ dry soil h⁻¹ for Center, Edge and Upland, respectively, and average N₂O reduction rates of 0.063, 0.132 and 0.002 N₂O-N kg⁻¹ dry soil h⁻¹. Nitrous oxide production and reduction in subsurface soils maintained low rates and showed small variations between depths and hydrological zones. Our results suggest that N₂O dynamics were affected by depth, mainly through labile organic carbon (C) and microbial biomass C, being influenced by hydrological zone primarily through soil NO₃^- content. The spatial distribution of N₂O fluxes from denitrification along the hydrological gradient is likely attributed to the differences in N₂O production and reduction in surface soils.     

设施养殖肉牛应激反应综合症防治探讨

肉牛应激反应综合症在现代规模化设施养殖条件下发病率高,机体为动员大量能量来对付应激原的刺激而使分解代谢增强,合成代谢降低,出现负氮平衡,适应机能破坏,生理功能降低,内分泌和代谢失调,引发各系统机能紊乱甚至死亡.在前期病因和发病机理研究的基础上,对设施养殖肉牛应激反应综合症防治方法进行了探讨,提出了添加抗应激药物等综合防治措施.