Nitrogen, phosphorus and potassium are the three elements of crop fertilizer
nitrogen

1, function: nitrogen fertilizer is the largest demand in agricultural production of fertilizer varieties, it is a component of plant protein and chlorophyll, to improve crop yield, improve the quality of agricultural products have an important role, so that the plant body growth, tillering fast, full ear, high yield.

2, nitrogen deficiency symptoms: crop plants are short, thin, leaves are yellow green, yellow orange and other abnormal green, serious old leaves almost yellow, and even dry death; Less root branching.

3, excessive harm: the cell growth is too large, the cell wall is thin, the cell is juicy, the plant is soft, and it is vulnerable to mechanical damage and bacterial invasion.