Reduce piping in size along line - more economical and holds pressure better. If sprinklers in greenhouse, you will want ample overlap of sprinklers - wind creates dry spots. Use gate valves on risers to not water certain areas. Automatic systems - expensive, check California to see latest methods and experience. Tube watering - best on larger plants, keeps leaves and roads dry, better working conditions.
Water needs vary - time, soils, species, size, temperature, humidity, wind, light.
Group plants by needs, container size, media, species, - standardize if possible. Wilting of plant or soil adhesiveness tests of water status. Water thoroughly at planting. Grower must determine peak needs of system. Quality critical - salts, chromium, boron.