2种桃树砧木性状和抗性评价

1GF677(P.amygdalus×P.persica)由法国于20世纪60年代杂交选育而成,根系发达,长势健壮,树冠高大。与桃和油桃品种间嫁接亲和力强,对碱性土壤有很强的适应性,主要表现为抗缺铁失绿;     

美国猪肉产业遭受严重打击 损失超几百万美元

本刊辑：中国猪网5月11日消息，据澳大利亚广播报道，美国猪肉产业正在遭受一次严重的经济打击。据统计，因甲型H1NI流感的影响，美国猪肉产业损失超过几百万美元。     

严惩森林失火犯

前不久，江华瑶族自治县在县城沱江体育广场召开森林火案公捕大会，对今年涉嫌失火烧山的12名犯罪嫌疑人进行了公开逮捕。通过以案释法，给现场上万名群众上了一堂生动的法制教育课。     

蒲公英配蜂蜜治胆结石

<正>据《本草图经》载,蒲公英属菊科多年生草本植物,它含有蒲公英甾、醇胆碱、葡萄糖、菊糖和果胶等10多种化学成分,有清热解毒、善清肝热、消痈解结、利尿通淋等功效。用于治疗目赤肿痛、多种感染、大便秘结、扁桃体炎、急性咽喉炎、急性支气管炎、化脓性疾病、乳痈、肠痈、疔疮等多种病痛。民间苗医常用蒲公英治疗     

提高水产饲料水中稳定性的措施

水产饲料在水中的稳定性是指饲料在水中浸泡一定时间后,保持组成成份不被溶解和不散失的性能.一般以一定时间内饲料在水中的散失量与饲料质量之比的百分数(即散失率)表示,也可用饲料在水中不溃散的最少时间表示.技术上鱼饲料水中散失率小于20%(浸泡30min),对虾饲料水中散失率小于12%(浸泡2h),同时,要求饲料在浸泡的过程中表面形成一种保护膜,使料中的水溶性元素不被溶失.否则,容易造成饲料的浪费,水体的污染,消化吸收的障碍和饵料系数的提高.因此,饲料的水中稳定性是评价渔用饲料的一项重要指标.本文笔者就如何提高水产饲料水中稳定性予以介绍,仅供业内人士参考.     

怎样防止君子兰叶子发黄

君子兰黄叶的原因主要是由于管理不当。导致君子兰黄叶,不外乎以下几个原因：1水浇大了：花盆积水时间过久,叶片容易产生浸润性变黄,发生部位为嫩叶尖端,症状由上往下发展。2缺水：过于干旱,或每次都浇半截水,老叶就要黄尖。3肥大：施肥过多过浓,会引起烧根,叶片黄尖。4缺元素失绿：盆土中如缺铁元素,叶片顶端先变黄。如缺氮素,新叶呈黄白色。     

Does Biochar Addition Influence the Change Points of Soil Phosphorus Leaching?

Phosphorus change point indicating the threshold related to P leaching, largely depends on soil properties. Increasing data have shown that biochar addition can improve soil retention capacity of ions. However, we have known little about weather biochar amendment influence the change point of P leaching. In this study, two soils added with 0, 5, 10, 20, and 50 g biochar kg-1 were incubated at 25℃ for 14 d following adjusting the soil moisture to 50% water-holding capacity （WHC）. The soils with different available P values were then obtained by adding a series of KH2PO4 solution （ranging from 0 to 600 mg P kg-1 soil）, and subjecting to three cycles of drying and rewetting. The results showed that biochar addition significantly lifted the P change points in the tested soils, together with changes in soil pH, organic C, Olen-P and CaC12-P but little on exchangeable Ca and Mg, oxalate-extractable Fe and Al. The Olsen-P at the change points ranged from 48.65 to 185.07 mg kg-1 in the alluvial soil and 71.25 to 98.65 mg kg^-1 in the red soil, corresponding to CaCl2-P of 0.31-6.49 and 0.18-0.45 mg L~, respectively. The change points of the alluvial soil were readily changed by adding biochar compared with that of the red soil. The enhancement of change points was likely to be explained as the improvement of phosphate retention ability in the biochar-added soils.