Some Agricultural Treatments for Okra (Abelmoschus esculentus l.) Production Under Low Temperature Conditions | ||
| Journal of Plant Production | ||
| Article 13, Volume 7, Issue 8, August 2016, Pages 893-902 PDF (626 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2016.46206 | ||
| Author | ||
| Kh. A. A. Soubeih* | ||
| Department of Plant Production, Desert Research Center – Cairo, Egypt | ||
| Abstract | ||
| Two experiments were conducted during 2007- 2008 and 2008 – 2009 growing seasons at Mariut farm of the DesertResearchCenter. The aim of the experiments was to compare growth, yield and its component and nitrogen and carbohydrate contents as well as to determine base temperature and accumulated heat units of okra as influenced with transplanting date and nitrogen source. Five transplanting dates were investigated which were; Jan.15th, Febr.1st, Febr.15th, March.1st and March.15th. Four nitrogen sources were studied which were: Urea, ammonium nitrate, ammonium sulfate and compost; the applied quantity of each source contained 90 nitrogen unit; beside control treatment which was ammonium nitrate at rate of 60 nitrogen unit (the recommended dose). Seeds of okra were sown in artificial media under greenhouse for 40 days before transplanting in the field. Results revealed that survival ratio and the investigated growth parameters, chlorophyll content, yield and its components, nitrogen and carbohydrates of pods and nitrogen use efficiency were increased with delaying planting date. Compost followed by urea treated plants gave the highest values. Interaction results showed that compost treated plants transplanted on March 15th had the best growth and yield. Base temperature of okra, Balady cultivar was 6.55 °C (43.8 °F). Accumulated heat units above base temperature required till the first flower was 982.8 ± 44.5 heat units without insignificant differences among different transplanting dates. This indicated that flowering time was dependent upon accumulated heat units rather than number of days required for the first flower. High significant positive correlations were found between yield of pods and either plant dry weight, leaves area, number of leaves / plant or number of pods per plant. Regression coefficients indicated that for each increase of one pod / plant, yield of okra pods correspondingly increased by 140.18 kg pods / fed. | ||
| Keywords | ||
| Transplanting date; nitrogen sources; okra (Abelmoschus esculentus L.); Growth; yield; pod quality; Nitrogen use efficiency; base temperature; accumulated heat units | ||
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