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就是不知道施哪种肥, GOOGLE一下, 说是钾肥Potassium不一定能促进开花.
Despite what many people say, in most plants potassium does not directly stimulate or 'promote' flowers to develop on plants.
For many years, I worked in a retail nursery and a common question I was asked by customers is about the relationship between the nutrient potassium and flowering. Many people mistakenly believe that if they fertilise their plants with potassium (or "potash"), their plants will produce more flowers.
Unfortunately, there is little scientific evidence which supports the idea of potassium stimulating floral initiation (making more flowers as a result of potassium). It is nothing more than a myth.
This article aims to shed light on the role of potassium in plants and why applying potassium to a healthy plant will not alter the number of flowers that plant will produce.
Let's start by looking at potassium and its role in plants:
Potassium: A macronutrient
Potassium (K) is a common nutrient found in many organic and inorganic fertilisers. It is often called a 'macronutrient' because it is required by plants in high concentrations compared to other nutrients. (Only nitrogen is required in greater amounts than potassium).
Potassium is sometimes sold in the following forms:
•Potassium chloride (KCl)
•Potassium dihydrogen orthophosphate (KH2PO4)
•Potassium nitrate (KNO3)
•Potassium sulphate (K2SO4)
These compounds are often mixed with other nutrients to make a 'complete fertiliser' as this is often easiest for home gardeners to work with. You can determine how much potassium is in a fertiliser by looking at the N :K ratio which is the ratio of nitrogen to phosphorous to potassium.
What does potassium do in plants?
Potassium has an important role regulating water and nutrient movement in plant cells.
All plants are composed of cells. When you water a plant, water travels from the root cells, through the plant's vascular system (called the xylem) to the leaf and flower cells. Nutrients from the soil also travel a similar path. If lots of nutrients enter a cell, then the cell will have a greater osmotic gradient and want to take in a lot of water and expel the nutrients to restore osmotic balance.
Conversely, if a cell contains a lot of water and few nutrients, it will have a lesser osmotic gradient and will want to take in nutrients and expel the water. This process is called osmosis, and in a natural system an equilibrium would develop so that the osmotic gradient was the same in both cells meaning that there would be the same number of nutrients and water on each side. Plants are not 'natural systems' in this sense because they control their water movement
Text by Adam Dimech. Read more at http://www.adonline.id.au/flowers/the-potassium-myth/ |
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吐血奉献，新足迹史上最客观，最全面的关于NRAS的评述 (2013-10-19) 清咖一杯 
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发表于 2012-1-2 12:17
发表于 2012-1-2 12:18
