Spices and Condiments
Important crops in this group are turmeric, ginger, cardamom, cumin, coriander, betal vine, black pepper and chillies. Only limited information is available on the water management practices of these crops. Turmeric, ginger and chillies should be grown on broad ridges and irrigated to maintain over 50 per cent of available moisture in the zone of maximum root spread which is the top 60 cm layer of soil. Coriander and Onion are winter crops and need irrigation at intervals of 10 to 12 days on light soils and 15 to 20 days on heavy soils. The water requirements of these crops are around 500 to 600 mm.
Lawns and Gardens
In parks and gardens, seasonal flowering plants need to be irrigated frequently to maintain the surface 30 cm soil layer moist. These plants should receive irrigations at an interval of five to eight days depending upon the severity of the climate. A lawn may be irrigated at an interval of eight to ten days in summer and 15 to 20 days during winter to maintain its good growth. In lawns, one has often to resort to surface irrigation methods and hence proper consideration should be given to levelling at the time of planting to ensure that water will spread uniformly. The young shrubs and live-fences should be irrigated along with the lawns. Fully developed ornamental trees may be able to tap deep percolated water and hence no special care may be necessary for their growth.