Each type of plant has a water level that berdeda vary. Based on this, the type of cultivated plants should be arranged so that water needs can be met. The types of plants that are cultivated are:
a. Rice plants
Rice is a crop that requires a lot of water during growth. Estimated water requirements for rice is 4 times the water demand for crops.
b. sugar cane crop
In addition to rice crops, other plants that need to be considered in terms of watering is sugar cane. Sugar cane crop given sufficient water in the dry season but the cane does not need to be watered during the rainy season. Estimated water demand for sugarcane crop was 1.5 times the water demand for crops.
c. crops
Which is included in crops include corn, soybeans, tobacco, cotton, chilli, peanuts and others. Plants are usually grown in the dry season and does not require much water. The water requirement for crops is from 0.2 to 0.25 l / s / ha.
d. acreage
The more widespread irrigated rice cultivation, the irrigation needs more and more. Settings area of the plant will limit the amount of crop water needs. This setting only occurs in areas where the water is limited. Planting area also affect the amount of cropping intensity. Cropping intensity is the ratio between the area planted with land area per year.
e. Debit provided
If the debit tersedai large enough, then almost all types of plants can be met their needs so that in general the provision of water can be done continuously.
f. Type of cropping patterns
Determining the type of pattern of cropping is usually adjusted to the flow of water available in each planting season. Type cropping an irrigated area can be classified into: (a) Rice – Rice, (b) Rice – Rice – Crops, (3) Rice – Crops – Crops
systems Group
If the flow of water available is already known, the next step is to set whether or not to group systems, this is due to the processing of the soil at the beginning of the rice planting season dipenlukan water very much, especially for plants rainy season that it must begin at the end of the dry season when the river discharge in general, they are small and rainfall is little. Therefore, to control irrigation water needs to be done with the group system, in which the initial processing of land throughout the irrigated areas are not simultaneous.
The trick irrigated area is divided into several sections (sections 3-5 / group), where the initial provision of water for each part is not the same. In general, within 10 or 15 days between groups with each group benikutnya. This is called the distribution of water in groups, each section of the irrigated area is called class. With this group systems are able diperkecilnya advantage of channel dimensions and the building, due to be smaller peak needs water.