计算机辅助农作物高产栽培专家系统的设计

该文依据广西农作物的生长习性，栽培特点，需肥规律进行大田试验，根据试验结果和专家经验，应用计算机辅助农作物高产栽培专家系统设计。     

浅谈秸秆的综合利用

我国每年产生5亿～6亿t秸秆,但经过各种处理的仅1600万t,相当于秸秆总量的2.67％,秸秆焚烧不仅烧掉了珍贵的可再生资源,而且污染空气,危害人民健康,影响工业生产和交通安全,煤焦了土壤,驱散了水分,还破坏了土壤团粒结构。因此,综合利用农作物秸秆是农业可持续发展的重要举措。 一、秸秆直接还田,用养结合 据有关资料,秸秆直接还田,主要有恢复和创造土壤团粒结构,固定和保存氮素养料,以及促进土壤中难溶性养料     

绵羊肉用改良与肥羔生产技术

项目完成单位：陕西省神木县牧兽医工作站“绵羊肉用改良与肥羔生产技术”是神木县畜牧站根据当地市场经济发展需要自选的畜牧应用技术研究与推广项目。     

Agricultural expansion in Yunnan Province and its environmental consequences

Yunnan Province with numerous international rivers has huge impacts on downstream countries such as Burma, Laos and Vietnam. Agricultural expansion in Yunnan has conferred and continues to confer detrimental impacts on environments. In the past 43 years （1960-2003）, the increase in crop yield was associated with a 99.1-fold increase in fertilizers, 2.0-fold in pesticides, and 0.4-fold in cultivated lands, respectively. Based on linear regression of the past trend, the next doubling of crop yield in the future would be accompanied by the increase in fertilizer application （from about 1.3×10^9 kg to 3.6×10^9 kg）, and the increase in application of pesticides （from about 2.7×10^7 kg to 9.6×10^7 kg）. Similarly, the total amount of cultivated lands would increase from about 5.9×10^6 ha to 9.3×10^6 ha. In the past decades, these changes have caused a series of environmental problems such as agricultural non-point source pollution （ANSP）, deforestation, land degradation, and biodiversity loss. If the escalating status continues as our prediction, those problems would get worse and be tough to be dealt with. As for the situation in this region, some practices to minimize the impacts should be implemented in controlling population growth, protecting wetlands, developing tourism, and utilizing fertilizers and pesticides more rationally.     

股静脉穿刺置管法的改良及临床应用

目的 对股静脉穿刺置管方法改良并进行临床验证.方法 选择2003年至2006年卧床危重心脑血管病人30例为A组,行改良的股静脉穿刺置管术,置管时不使用扩张管,穿刺点比常规的进针点位置放低4～5 cm;与1999年至2002年30例(B组)行常规的股静脉穿刺置管术比较.结果 A组1次穿刺成功25例,总穿刺成功率100%,误穿刺动股5例,局部血肿发生3例,局部渗血2例,比较B组穿刺成功率高,误穿股动脉发生率及局部渗血发生率低(P＜0,05).结论 改良的股静脉穿刺置管方法,具有操作简捷方便、穿刺成功率高,尤其能减少误穿股动脉、局部渗血等并发症,是一种值得推广应用的股静脉穿刺方法.     

全球气候要暖多久

在首届中国气候大会上，与会的气象专家们达成了这样一个共识：地球的气候系统正经历一次以全球气候变暖为主要特征的显著变化，这是近万年来地球上出现的第3次暖期。从观测到的数据分析，地球的气候一直是呈波动式变化的．冷暖交替出现，目前正处于暖期。近一万年来，地球上气温的波动幅度在2摄氏度到3摄氏度之间，这样一共经历了3次暖期。     

走在十字路口的中国画

中国画发展至今,面临着严峻的挑战,是继续沿着传统的轨道发展下去,还是另辟蹊径,亦或如某些极端反传统者所主张的“末日论”、“死亡论”、“穷途末路论”,或干脆抛弃而以西方现代艺术取代中国画,本文简要分析中国画发展所面临的困境,并就其发展取向叙述了作者的观点。