蚯蚓粪改良老化土壤效果好

因长期施用化肥，畜禽粪施用不当以及植物重茬造成的地力下降，土壤老化、板结现象日益严重。实践证明，施用蚯蚓粪改良老化土壤是一个好办法。     

浅谈园林苗圃建设与生产技术要点

<正>随着现代园林城市建设的发展,对城市绿化、美化效果和景观质量的要求标准不断提升,对景观绿化植物的需求空间日益扩大,为此,高标准的园林生产显得更为迫切。本文主要从圃地选择、土壤改良、种植规划和苗木生产管理等方面,简要阐述了园林苗圃的建设及生产技术措施。     

上海蓝莓种植面积达66.67公顷

本刊讯(特约通讯员袁亚祥)上海郊区一直不适合种植蓝莓,市面上销售的蓝莓鲜果多为进口。笔者日前从上海农业部门了解到,通过品种筛选、土壤改良等办法,上海郊区已成功种植一批优质蓝莓品     

生物质灰对红壤酸度的改良效果

用采自安徽、浙江、湖南和广东的4种红壤和1种赤红壤,通过室内培养实验研究了添加生物质灰对酸性土壤的改良效果。结果表明,添加生物质灰提高了土壤p H,降低了土壤交换性铝含量,且阳离子交换量(CEC)越小改良效果越明显。改良后土壤交换性K+、Ca2+、Mg2+含量也显著增加,交换性Ca2+增幅最大,其次为交换性K+。有效磷含量也有增加,磷含量较高的土壤有效磷增幅更大。虽然生物质灰含有一定量的重金属,但由于用量较少,对土壤有效态重金属含量的影响小,施用生物质灰的环境风险较小。总之,添加生物质灰不仅可以有效改良红壤酸度,还可提高红壤肥力。     

Effect of low-molecular-weight organic acids on Cl- adsorption by variable charge soils

Low-molecular-weight (LMW) organic acids exist widely in soils and have been implicated in many soil processes.The objective of the present paper was to evaluate effect of two LMW organic acids, citric acid and oxalic acid, on Cl^- adsorption by three variable charge soils, a latosol, a lateritic red soil and a red soil, using a batch method. The results showed that the presence of citric acid and oxalic acid led to a decrease in Cl- adsorption with larger decreases for citric acid. Among the different soils Cl- adsorption in the lateritic red soil and the red soil was more affected by both the LMW organic acids than that in the latosol.     

Breakdown of azadirachtin A in a tropical soil amended with neem leaves and animal manures

A field investigation was conducted to assess the breakdown of azadirachtin A in a tropical coastal savanna soil amended with neem leaves （NL） combined with poultry manure （PM） or cow dung （CD） using gas chromatography. Samples in polythene bags 15 cm long and 4.8 cm in diameter were randomly placed to a depth of 14 cm in the soil, and azadirachtin A concentration was assessed on days 0, 14, 28, 42, 56, 70, and 84. Azadirachtin A degradation in the soil followed first-order reaction kinetics with different half-lives obtained for varying combinations of the amendments. Higher neem amendment levels of 100 g gave shorter half-lives of azadirachtin A than the lower levels of 50 g. Within the 50 g NL group the additions of the poultry manure and the cow dung gave significantly shorter （P 〈0.05） half-lives of azadirachtin A than the sole neem amendment, whereas in the 100 g NL group only additions of 10 g CD and 10 g PM were significantly less （P 〈 0.05） than the sole neem amendment. Different changes resulting from the kind and quantity of animal manure added were observed in the half-lives of azadirachtin A. The 100 g NL group had significantly higher （P 〈0.05） moisture content, which, coupled with the likely differeaces in microbial biomass, could be the major factor responsible for variations in the half-llfe of the compound. Therefore, the quantity of the neem leaves applied and the addition of animal manure affected the breakdown of azadirachtin A in the soil amended with neem leaves.     

改良酸化土壤效益好

经济效益2012年北湖区4个乡镇26个村施用生石灰粉2000吨,改良酸化土壤面积1670公顷。通过酸化土壤改良,经定点监测表明:每667平方米早稻增产79.8公斤,晚稻增产45.8公斤。烟叶品质提升明显,烤烟产值每667平方米增加346元。通过酸化土壤改良,     

论陈旉《农书》对《齐民要术》的继承和发展

北魏贾思勰的《齐民要术》作为中国最杰出的农书之一,对后世产生了深远的影响,南宋陈旉在自己本人丰富的农业生产经验的基础上,对《齐民要术》进行了继承和发展,从而取得了巨大成就.成为一部在中国农学史上堪称一流的农书.而这种继承和发展主要体现于天时论、肥料和土壤改良技术、耘田与节用防奢四个方面.     

蔬果天天遭“秒杀” 七禾有机农场土里生“金”

每天21:30,总有数百名七禾有机农场的会员等候在电脑前,准备第一时间在农场网站上抢购自己喜爱的蔬果。大白菜30元/kg,西红柿60元/kg,西瓜90元/kg……在七禾有机农场里,价格"惊人"的蔬果根本不愁卖。农场成立一年来,从投资1 000万元的一期7 hm2地产出看,平均每667 m2年产值超过10万元,农场会     

江苏省宜农未利用地开垦土壤改良模式研究

系统分析了江苏省主要宜农未利用地类型、分布及其开垦的土壤障碍因素,探究了土壤改良的工程措施、农艺措施、生化措施及其作用,研究提出了荒草地和沿海滩涂2种主要宜农未利用地开垦的土壤改良模式,注重了各种改良措施的综合运用,对于合理制定江苏省宜农未利用地开垦土壤改良方案,提高土地开垦的质量,实现江苏省耕地总量动态平衡具有重要的指导意义。