小麦稈枯病菌(Gibellia cerealis Pass.)子囊孢子萌发试验

 小麦秆枯病过去在国内仅在少数地方零星发现^[1],很少有叹注意。近几年来在华北局部地区有严重发生的趋势。     

The influence of Agral 90 surfactant on the activity of imazamethabenz in wild oats (Avena fatua L.)

The influence of the nonionic surfactant, Agral 90, on the activity of imazamethabenz in wild oats (Avena fatua L.) was investigated in glasshouse and laboratory trials. Agral 90 significantly increased the efficacy of imazamethabenz against wild oats at a range of growth stages; a significant decrease in activity of both imazamethabenz alone or with Agral 90 was observed following application to plants possessing tillers. At 0.1 kg ha^?1, the growth of tillers was significantly reduced by imazamethabenz plus Agral 90. The retention of imazamethabenz on wild oat foliage was significantly increased by Agral 90 incorporation; Agral 90 also facilitated retention of imazamethabenz on the tillers. The absorption and translocation of imazamethabenz were significantly enhanced by Agral 90; greater amounts of the labelled material were found in all regions of the plant except the tillers which existed at the time of application.     

影响磷灰石有效磷含量的因素及磷灰石的分类

各种磷矿石具有不同的有效磷¹⁾含量已是众所共知的事实。本文主要研究决定不同有效磷量的一些有关因素和有效磷含量的变化与各种磷灰石性质的关系。这些问题在研究磷矿石磨成粉体作为磷肥直接施用的肥效时,具有实际的应用价值。     

用四苯硼钠测定钾的新容量法

钾的分析是土壤、肥料、植物灰分、矿物等样品分析中的重要项目,然而惯用的钾分析方法均不够理想。氯铂酸法试剂昂贵;亚硝酸钴钠法近年来虽然有很大的改进,但尚有一些缺点;火焰光度法需要特殊设备。因此,设计出一种既简单又准确的钾分析方法,是当前农业科学研究及土壤肥料实际工作中的一项重要任务。