Key Ring Agriculture Implements

The color of crop leaves and nitrogen fertilizer volume are closely related.

Nitrogen fertilizer is low, leaves become yellow green. Conversely, when nitrogen fertilizer is high, the leaves become dark green.
In practice, we can refer IRRI (International Rice Research Institute) to compare the leaves color with the Leaf color plates.

This is a simple tool, you can objectively compare the colors to aid identification of leaf color shades.
Leaf color plates simulate different shades of leaf color. Leaf color plates from yellow to dark green is divided into four different grades, these grades are specify the value as 2,3,4,5.
Color value from 2 to 5, leaf nitrogen content increased, but also shows the amount of leaf nutrient supply within the gradual accumulation.
Use of leaf color plates to compare leaf color, you can then judged the nutritional status of the plant.

How to use Leaf color plates

1. In rice tillering and panicle initiation stage, which is the second top-dressing and ear manuring ago, in the rice fields selected at random 10 or more, not infected rice plants inaba.

2.  Per plant rice inaba, to select the top, has been fully expanded leaves. View the middle part to match leaf color plates.

3.  At the outdoors shade where the sun does not shine directly, let the front of leaf toward you for leaf identification. Identify the value compared to leaf color plates (different color density value from 2 to 5). Do not directly observe both under the sun, so as to avoid light reflection and affect the accuracy of identification of leaves.

4.  Record 10 leaves value (if the color is located between 2 value and difficult to determine, you can use decimals), calculated the average value of 10 leaves. You can understand the overall nutritional status of this area, to determine how to fertilize.

5. Color identification should consider the ambient light intensity, avoid direct sunlight or artificial lighting for identification, so as to avoid errors.