Response of Late Maturing Hybrids Seed Corn to the Application of Potassium Sulfate under Deficit Irrigation
Subject Areas :
Journal of Crop Ecophysiology
Zohreh Henteh Henteh
1
(
M.Sc. Graduated of Agronomy, Naragh Branch, Islamic Azad University, Naragh, Iran.
)
Roghayeh Aminian
2
(
- Assistant Professor, Production and Plant Breeding Department, Faculty of Agriculture and Natural Resources, Imam Khomeini International University, Qazvin, Iran..
)
Received: 2016-08-04
Accepted : 2017-01-15
Published : 2017-07-23
Keywords:
stepwise regression,
Drought stress,
Maize,
Potassium fertilizer,
Abstract :
To study the effect of potassium sulfate on seed yield, yield components and traits affecting seed yield of late maturing corn, a split split plot experiment using a randomized complete block design with three replications was carried out in Kashan Desert Research Station. Irrigation levels consisted of complete irrigation and cutting off irrigation at panicle emergence and seed filling stages which were considered as the main factor, three levels of potassium sulfate 200 (recommendation based on the soil analysis), 245 and 290 kg.ha-1 as the subplot, and two single cross of corn, KSC 700 and 704, as sub-sub plots. Effect of irrigation on traits like seed number per row, 1000 seed weight, biological yield, relative water content and relative water loss were significant. The effect of cultivar on all traits, except relative water loss, and the effect of fertilizer on all traits, except number of rows per ear, were also significant. All of the KSC700 traits, except plant highest were better than those of cultivar KSC704. The highest values for the most traits were obtained in full irrigation condition, applying potassium sulfate at the rate of 290 kg.ha-1 for KSC 700. Cutting off irrigation at the panicle emergence of KSC 900 and seed filling of KSC 704 did not cause significant reduction in seed yield. Highest correlation of grain yield were obtained with number of kernels per row, 1000 grain weight and harvest index. Stepwise regression results showed that number of rows per ear, number of kernels per row and 1000 grain weight in KSC 700, and biological yield and harvest index in KSC 704 justified 98.7 and 98.5 percent of changes, respectively.
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