1. Observe the structural characteristics and light source direction of oranges before painting.

2. The following is the structural diagram of oranges. You can practice painting before painting.

3. Then start molding. When drawing the shape of an orange, cut a rough outline with a long line instead of a circle.

4. Then further improve the outline of the orange, find out the dividing line between light and dark, and explain the dark parts and shadows with a soft pencil.

5. Then from the boundary line to the dark part, the projection changes from real to virtual.

6. Finally, adjust the edge of the orange to show the contrast between the orange and the interlining.

Cultivation of citrus trees:

1, cure seedlings.

Cut off the rotten and dead roots of the roots of orange saplings, then cut off the roots that grow too long to facilitate the all-round extension of the roots, then soak the roots in carbendazim solution for 30 minutes, and finally take them out and dry them in a ventilated place.

2. Planting method.

Dig out planting holes with a plant spacing of 3 meters and a row spacing of 4 meters in the plot, then apply decomposed farmyard manure into the holes, then put orange trees into the holes, fill the holes, and finally pour enough water to fix the roots. In addition, you can also cover a layer of coconut bran around the plants to achieve the effect of heat preservation and moisture retention.

3. Fertilizer and water management.

During the growth of orange trees, compound fertilizers of nitrogen, phosphorus and potassium can be applied to them in the form of ring ditch, strip ditch or hole. Fertilize them 5-6 times when the plants sprout in spring, summer and autumn, water the soil in time when it is dry, and pay attention to drainage in rainy season.

4. Precautions.

The main branches and extended branches of orange trees need to be pruned moderately or severely in the young tree period to promote the balance between branches, and the summer shoots should be erased in the fruit-bearing period to promote the autumn shoots to be strong.