博文

目前显示的是 十月 8, 2015的博文

Secondary and Micronutrients For VEGETABLES AND FIELD CROPS

Plant nutrients in fertilizers are classified as major nutrients and micronutrients. 
The most important.Major nutrients are nitrogen (N), phosphorus (P) and potassium (K). 
Plants require these nutrients in relatively large amounts, 
and these are the nutrients most likely to be deficient for plant growth. 
The other major nutrients, also called secondary nutrients, are calcium (Ca), 
magnesium (Mg) and sulfur (S). 
They are also required in relatively large amounts but are less likely to be deficient. 
Micronutrients are essential for plant growth, but plants require relatively small amounts of them. 
They include boron (B), copper (Cu), iron (Fe),manganese (Mn), molybdenum (Mo) and zinc (Zn).
These elements may also be referred to as minor or trace elements, but “micronutrients” is preferred.

Calcium Deficiency Symptoms
Calcium deficiency is usually observed as a failure of terminal buds and apical root tips to develop.
In corn,new leaves fail to emerge from the whorl because of a sticky, 
gela…