Study the effects of potassium on water use efficiency of tomato ,case study: Bushehr province.
2004
Poozesh Shirazi, Morteza | Moradi, Ghassem | Mivehchi Langeroodi, Hassan
Tomato is one one of the most important vegetables that is used by human. High price of tomato because of its out season production in Bushehr province has made a spread tendency for farmers of this area to cultivate it in fall and winter. Proper utilization of water resources in order to increase water use efficiency is so sensed according to recent drought in the south of Iran. Therefore, a study was conducted in Bushehr Agricultural Research Center (located in Borazjan) to determine the effects of potassium on W.U.E of tomato. This experiment was carried out on Randomized Complete Block design (split plot) with three replications during 1999 _ 2001. The treatments of this study were as follows: Irrigation water depth in four levels (50- 70- 90 and 110 mm of pan evaporation) as main plot and Potassium Sulfate fertilizer in four levels (0- 175- 265 and 350 kg/ha) as sub plot. Results showed that tomato yield was significantly effected by both factors, however their interactions were not significant. The highest tomato yield (37.84 ton/ha) was obtained by utilization of 175 kg/ha from Potassium Sulfate with 50 mm of pan evaporation as irrigation water depth. More quantities of Potassium Sulfate ( 175 kg/ha) did not decrease water stress effects and even, yield reduction was observed.The highest W.U.E was 5.1 kg tomato per one cubic meter of used water.
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