Sunflower Plant Water Requirements
Sunflowers are drought tolerant but grow better if you.
Sunflower plant water requirements. Reproductive stages begin when a miniature floral head appears with progressive growth until the capitulum opens and anthesis begins. At the initial stage of growth the sunflower plants were small and the water use was low. Percentage of total crop water use over the different growth periods is about 20 percent during vegetative period 55 percent during the flowering period and the remaining 25 percent. Dahlia pinnata and vinca diformis were third with a growth rate of 0 026g while cosmos bipinnatus had the lowest growth rate 0 022g.
Once the plant is established water deeply though infrequently to encourage deep rooting. Sunflowers helianthus annuus grow as annuals with some varieties only living for two months. To protect the plant it may help to put snail or slug bait around the stem. The sunflower root system growth has a high sensitivity to soil strength so poor soil preparation can affect the absorption of water and mineral nutrients during later stages of the crop cycle.
Water use during the sunflower growing season in 2006 2007 and 2008. Sunflowers come in many varieties some of which are hardy as far north as u. As the plants grew during july transpiration increased with increasing leaf area. Zinnia elegans had the highest growth rate and minimal water requirements of the five plants with mean biomass of 1 81g followed by the sunflower plant helianthus annuus with biomass of 0 134g.
They thrive in hot weather with full all day sunlight but they require 34 inches of water annually for best growth. On the plant spectrum sunflowers are pretty thirsty creatures. Watering after germination according to kansas state university the average sunflower uses 15 inches of water daily during active growth. The precipitation in 2008 was the highest among the 3 years.
While the plant is small water around the root zone about 3 to 4 inches from the plant. Some of that water comes from rain and natural water in the soil but most is dependent on regular watering. Having a relatively short season means they have a rapid growth rate and this can only be fueled by plenty of water and as much sunlight as possible. They need to be as one of the few flowers that can grow up to 15 feet 4 5m or higher.
Because sunflowers tend to drain soils of their nutrient resources the thomas jefferson agricultural institute recommends against planting sunflowers in the same field more frequently than once every three to four years. Therefore sunflower water use increased and reached a maximum in july or august. High evapotranspiration rates are maintained during seed setting and early ripening period. As their name implies sunflowers require sunny conditions to thrive.
If you grow sunflowers in the same spot every year you will need to enhance the soil with compost or fertilizer each time you plant. The water requirements of sunflower vary from 600 to 1000 mm depending on climate and length of total growing period. Unless the weather is exceptionally wet or dry water once a week with several gallons of water.
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