Abstract
A surface drip irrigation system was developed to irrigate peanuts in twotopographic fields. Peanut pod yield, kernel size distribution, and total sound mature kernelswere evaluated with two peanut varieties, two planting patterns and two drip tape lateralspacings. Test results were compared with the adjacent non-irrigated area planted with thesame varieties of peanuts. Soil temperature and volumetric moisture content were measuredat different locations to track soil temperature and water movement from drip tapes. Themaximum soil temperature in the irrigated area was substantially lower than in the nonirrigatedarea. About 16 h were required for water to travel 46 cm and then hold the moisturefor 14 h before decreasing after either 12.5 mm or 25 mm irrigation was applied. Nosignificant difference (p<0.05) was observed in yields between 0.91-m and 1.82-m drip tapelateral spacings with surface drip irrigation. Peanut yields with surface drip irrigation were1.43 times the non-irrigated yield. The net yield gain from surface drip irrigation was 10kg/ha-mm during the two growing seasons. Yields tended to slightly decrease as the landelevation decreased for both irrigated and non-irrigated zones. Compared to the nonirrigatedareas, the drip irrigated area produced more large kernels than small kernels.
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