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Agronomy 2019, 9(2), 63; https://doi.org/10.3390/agronomy9020063

Effect of Water Supply on Spectral Traits and Their Relationship with the Productivity of Sweet Corns

1
Institute of Horticulture, Szent István University, Gödöllő, H-2100 Gödöllő, Hungary
2
Institute of Agricultural Research and Education Farm, Agrometeorological and Agroecological Monitoring Centre, University of Debrecen, H-4032 Debrecen, Hungary
*
Author to whom correspondence should be addressed.
Received: 18 December 2018 / Revised: 14 January 2019 / Accepted: 29 January 2019 / Published: 31 January 2019
(This article belongs to the Special Issue Agricultural Water Management)
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Abstract

Three super-sweet corn hybrids (Zea mays L. convar. saccharata) with different ripening characteristics were grown in three water supplies (regularly irrigated, deficit-irrigated, and unirrigated) to examine the spectral reflectance at leaf and canopy levels, leaf area index (LAI) during the stage of development and their relationship with the yield and nutritional quality. Under unirrigated conditions, the plant’s height, diameter, and weight of ears per plants, as well as total carotenoid content of kernels, decreased, SPAD values of leaves, normalized vegetation differential index (NDVI) and LAI were low. The difference in SPAD and LAI was higher between the hybrids during the silking than the tasseling period under water deficiency. Under unirrigated dry conditions, no correlation was found between SPAD, NDVI, and yield. Using deficit irrigation, SPAD measured during tasseling correlated closely with the individual husked ear and the final yields as well as the sugar and carotene contents of kernels. Under this condition, NDVI did not correlate with the yield, but LAI was correlated with the yield and its carotene content. Under deficit irrigated conditions, the 46 to 49 range of SPAD measured during tasseling predicted 23.5 to 26.7 t ha−1 depending on the hybrid, but this range predicted a yield lower by 6.4 to 10.1% during silking. View Full-Text
Keywords: sweet corn; normalized vegetation differential index; SPAD; nutritional quality; water deficiency sweet corn; normalized vegetation differential index; SPAD; nutritional quality; water deficiency
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Nemeskéri, E.; Molnár, K.; Rácz, C.; Dobos, A.C.; Helyes, L. Effect of Water Supply on Spectral Traits and Their Relationship with the Productivity of Sweet Corns. Agronomy 2019, 9, 63.

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