绿化苗木种植过程中肥料的选用及施肥方法

肥料在苗木生长中具有重要的作用,不同的肥料对苗木的影响有所不同,了解苗木肥料的种类及其对苗木生长的作用,掌握苗木施肥的方法及操作技术是影响苗木生长量和造林效益的重要因素。绿化苗木在种植养护的过程中离不开肥料,但对于不同的时期、不同的绿化苗木品种,施什么肥、施多少还是有一番讲究的。本文介绍了绿化苗木种植过程中肥料的选用及施肥方法。

苗木肥料的选用及施肥方法

施肥是苗木生产中重要的栽培管理措施,不同苗木对肥料的需求各不相同,施肥的时期也存在着一定的差异。因此,在苗木施肥中,要根据苗木的种类及苗木的生长状况综合考虑,确定肥料的种类及施肥量。本文从施肥种类、施肥量、施肥时期和施肥方式等方面对苗木施肥技术作了较为系统的论述,为今后苗木生产提供科学施肥的依据。

Various Methods Used for the Treatment of the Wet-Phosphoric Acid

Phosphoric acid obtained by the wet process is laden with impurities which limit its use in fertilizers. To expand its range of use, various methods have been proposed to purify it which range from simple fading-clarification to more complex operations. These processes include essentially the liquid-liquid extraction, chemical precipitation, ion flotation, adsorption on activated carbon, ion exchange resins. However, the use of these techniques is limited to a number of disadvantages such as high operational cost, environmental pollution, complicated process, limited effectiveness, etc.. Our contribution for this domain （purification of wet-phosphoric acid） consists to use clays which could be adsorbent materials alternative to both economic and less polluting. These are phyllosilicates which have a large adsorption capacity due to their large specific surface and their surface charge. In this study, we will detail the processes which present great importance for the treatment of wet phosphoric acid.

日光温室茄果类蔬菜滴灌节水栽培技术

日光温室茄果类蔬菜滴灌高效节水技术，是按照作物需水、需肥规律，根据土壤墒情和养分状况，通过滴灌系统将水和养分以较小的流量均匀、准确直接地输送到作物根部附近的土壤表面或土层中。