东方杉温室大棚扦插育苗技术     

尹中明  吴文 《江苏林业科技》2009,36(5):44-45

东方杉系杉科属间杂交新树种,半常绿高大乔木,具有耐水湿、耐盐碱、生长速度快、景观效果好、抗风等优良特性;东方杉不结实,且无性繁殖困难。该文介绍了东方杉温室大棚扦插设施准备,采穗圃营建,扦插育苗方法等育苗技术。应用于大规模苗木生产,平均成活率达到76.3%。  相似文献   

FA旱地龙在农作物上抗旱增产效果研究   总被引：4，自引：1，他引：3  

孙颖  赵晋蓉  苑刚峰  班桂琴  魏美荣 《山西农业科学》2002,30(3):38-41

在粮食、油料、蔬菜、瓜果等多种作物上使用FA旱地龙的结果表明 ,FA旱地龙能促进作物的生长发育 ,增强作物抗寒、抗旱、抗干热风等抗逆性能 ,减轻灾害 ,提高农作物产量。同时筛选出了在不同作物上FA旱地龙的最佳施用方法及施用适期  相似文献   

Analysis of Growth and Productivity of Indian Mustard (Brassica juncea) in Relation to FYM, Nitrogen and Source of Fertilizer     

R. H. Patel  T. G. Meisheri  J. R. Patel 《Journal of Agronomy and Crop Science》1996,177(1):1-8

A field experiment was conducted during the winter seasons of 1992–93 and 1993–94 at Anand to study the effect of FYM, nitrogen and source of fertilizer on growth and yield of mustard [ Brassica juncea (L.) Czernj & Cosson]. The results showed significant variation in leaf area index (LAI), crop growth rate (CGR), dry matter production and seed yield. The direct effect of farmyard manure (FYM) was conspicuous in improving the growth of mustard. FYM application at 10 tonnes ha⁻¹ significantly increased the LAI, CGR and dry matter accumulation per plant at almost all the stages during first year study (1992–93) and in pooled analysis. Similarly, nitrogen application registered maximum LAI, CGR at 75 kg level and RGR and NAR at 50 kg level at almost all the during both years. Sulphur carrying source (Ammonium sulphate plus single super phosphate) increased all stages growth characters. Maximum dry matter accumulation per plant and seed yield were recorded with highest levels of FYM (20 tonnes ha⁻¹), N (75 kg ha⁻¹) and source having S. Seed yield was strongly associated with LAI and dry matter accumulation per plant at all the stages.  相似文献   

Residue management for reducing evaporation in relation to soil type and evaporativity1     

S.S. Prihar  S.K. Jalota  J.L. Steiner 《Soil Use and Management》1996,12(3):150-157

Abstract. Usual residue-management options are to remove the residue, use it as mulch with or without undercutting or to incorporate it into the soil. While the role of surface mulch in evaporation has been widely studied, the information on the effect on evaporation of mulch with undercutting or residue incorporated into soil, particularly in relation to soil type and evaporativity (E_o) is lacking. We studied the effect of wheat straw used in various ways on the course of evaporation loss from soil columns with three soils at Ludhiana, India and one soil at Bushland, Texas, USA, under two E_o's Energy-limited evaporation rates under mulch (E_om) followed the soil-specific relation E_om/E_o= a e^(bRes+cEo), where Res is residue rate t/ha and a, b and c are constants; E_o, is expressed in mm/d. In an effort to model the total evaporation (CE) during the energy-limited stage ‘U’ was obtained from appropriate CE versus time curves and (CE-U) was regressed over (t - ti)^0.5 to obtain the slope ‘α’ (Ritchie 1972) for the soil-limited evaporation stage. The observed ‘U’ was independent of mulch rate and E_o but was strongly affected by soil type, Values of ‘α’ decreased with increase in mulch rate and decrease in E_o and coarseness of soil. The otherwise short lived benefit of evaporation reduction with mulch per se, which peaked after a few days was maintained when residue was mixed with soil at the stage when evaporation reduction reached a maximum; this benefit continued for several weeks. Cumulative evaporation values computed from ‘U’ and ‘α’ agreed closely with the observed values under straw mulch for loamy sand and clay loam soils and for ‘undercut’ and ‘residue mixed’ treatments on all soils regardless of E_o, and for all situations under small E_o. However, for sandy loam and silt loam soils under E_o of 10 mm/d, the modified square root of the time function of Jalota et al. (1988) gave a better fit.  相似文献   

农作物抗旱性鉴定仪的研制和应用     

陈毓荃  王志常  王志辉  兰晓纪 《西北农业学报》1997,6(3):92-95

依据陈毓荃等首次提出的连续升温电导法，研制了ＮＫＪ－１型农作物抗旱性鉴定仪，对１４种小麦抗旱性的鉴定结果与田间观测结果一致，也适于果树抗热性鉴定。  相似文献   

草地农业在宁夏农业种植结构调整中的切入点     

白爱红  王顺霞 《四川草原》2005,(5):56-57

论述宁夏农区耕地轮作牧草发展牧草种子业、草产业和生产绿肥的可行性,自然条件、利益、市场机遇,并推荐了适应宁夏地区种植的优良牧草种。  相似文献   

Improving cereal yield forecasts in Europe – The impact of weather extremes     

《European Journal of Agronomy》2017

The impact of extreme events (such as prolonged droughts, heat waves, cold shocks and frost) is poorly represented by most of the existing yield forecasting systems. Two new model-based approaches that account for the impact of extreme weather events on crop production are presented as a way to improve yield forecasts, both based on the Crop Growth Monitoring System (CGMS) of the European Commission. A first approach includes simple relations – consistent with the degree of complexity of the most generic crop simulators – to explicitly model the impact of these events on leaf development and yield formation. A second approach is a hybrid system which adds selected agro-climatic indicators (accounting for drought and cold/heat stress) to the previous one. The new proposed methods, together with the CGMS-standard approach and a system exclusively based on selected agro-climatic indicators, were evaluated in a comparative fashion for their forecasting reliability. The four systems were assessed for the main micro- and macro-thermal cereal crops grown in highly productive European countries. The workflow included the statistical post-processing of model outputs aggregated at national level with historical series (1995–2013) of official yields, followed by a cross-validation for forecasting events triggered at flowering, maturity and at an intermediate stage. With the system based on agro-climatic indicators, satisfactory performances were limited to microthermal crops grown in Mediterranean environments (i.e. crop production systems mainly driven by rainfall distribution). Compared to CGMS-standard system, the newly proposed approaches increased the forecasting reliability in 94% of the combinations crop × country × forecasting moment. In particular, the explicit simulation of the impact of extreme events explained a large part of the inter-annual variability (up to +44% for spring barley in Poland), while the addition of agro-climatic indicators to the workflow mostly added accuracy to an already satisfactory forecasting system.  相似文献   

欧美杂交杨Pnd-LRR3基因克隆及其抗锈菌侵染表达   总被引：1，自引：0，他引：1  

陈俏丽  李丹蕾  王峰  邹莉  王志英  牛春阳  王博文  零雅茗  崔嵘  张玉洲 《东北林业大学学报》2015,(3):95-98,103

为深入探究欧美杂交杨(Populus nigra×P.deltoides)感病的分子机理,以及抗病基因在发病过程中所起的作用,克隆了欧美杂交杨LRR3蛋白编码基因Pnd-LRR3。对Pnd-LRR3基因进行了生物信息学分析,并对其在抗锈菌过程中的功能进行了研究。Q-PCR结果显示,强致病性的落叶松-杨栅锈菌(Melampsora larici-populina)E4菌株接种6 h,Pnd-LRR3基因表达量上调增幅较大,168 h为显著下调。说明Pnd-LRR3基因在E4侵染过程中起到一定抗性作用,但最终无法阻止锈菌的侵染。  相似文献   

"早稻-冬草莓"轮作模式最佳种植期研究     

王芬  蔡霞 《安徽农业科学》2015,(35)

[目的]研究"早稻-冬草莓"轮作模式最佳种植期.[方法]根据双流县气象局1971 ～ 2010年气象资料,采用滑移气候相似距及数理统计方法,对"早稻-冬草莓"轮作模式最佳种植期进行分析.[结果]冬草莓最佳种植期在8月1日～翌年3月31日,其小苗移栽最早在7月中旬,最晚在8月中旬,最佳移栽时期平均在8月19日.早稻移栽时间平均为3月26日,拟收获期平均为7月26日.[结论]从气象角度研究了"早稻-冬草莓"轮作模式最佳种植期,为双流县推广该模式,最大限度地发挥光、温、水、土地的生态效益提供了科学的决策依据.  相似文献   

Organic input quality is more important than its quantity: C turnover coefficients in different cropping systems     

《European Journal of Agronomy》2016

Annual C input to soil is a major factor affecting soil organic carbon (SOC) dynamics. However different types of C-sources can have different behaviour, in relation to their chemical characteristics and how they interact with soil. Root-derived C, in particular, should be more efficient than other organic materials as a result of the physicochemical and biological characteristics of the surrounding environment, leading to a reduction in the C decomposition rate.To test this hypothesis, we considered a long-term experiment underway in Northern Italy since 1962, comparing permanent meadow and 6 different crop rotations over a wide range of nutrient inputs, in both organic and inorganic forms. C inputs from amendments were measured and those from crops were calculated using allometric functions and crop and residues yields. The time evolution of SOC was studied through a single-pool, first-order kinetic model, allowing the estimation of humification coefficients for residues, roots, farmyard manure and cattle slurries.The highest value of the humification coefficient was estimated for farmyard manure, which confirmed its high efficiency in stabilising SOC content. Root C presented a humification coefficient 1.9 times higher than above-ground plant materials while slurries were intermediate, with a humification coefficient roughly half that of farmyard manure and even lower that of roots.The quality of C input thus seems of fundamental importance for evaluating the sustainability of different cropping systems in terms of SOC dynamics.  相似文献