Effects of Potassium and Iron on Yield of Corn (Zea Mays L.) in Drought Stress

Abstract

In hot and arid regions, drought stress is considered as one of the main reasons for yield reduction. To study the effect of drought stress, Iron and potassium spray on the yield and yield components of corn, an experiment was carried out during the crop seasons of 2010 and 2011 on Abosaeid research field of Mahvellat as a split factorial within randomized complete block design with three replicates. The main plots with irrigation factor and three levels were considered: irrigation per 6, 9 and 12 days. Subplots were considered with and without Iron and potassium spray. The irrigation reduced the grain yield in irrigation per 12 more than other stages. Irrigation effects significantly on chlorophyll value, leaf relative water content, stem, ear and leaves dry weight, number grain in ear and row, number row in ear, unfilled seed percentage and thousand grains weight. Iron increased the seed yield and yield component, except unfilled seed percentage and SPAD. Using K, as compared with control treatment, causes the increase of grain yield, 1000 grains weight and number grain in ear 16.5, 9 and 5.5% respectively. Potassium could somewhat reduce the impact drought stress on corn.

Impact of Seed Priming with King Coconut Water on Growth and Yield of Okra (<em>Abelmoschus esculents</em> L.)

“…The minimum fresh weight of seeds per plant was recorded in T6 (4.43 g). Zare and Vazin (2013) stated that 1000 seed weight was significantly increased by effect of potassium like micronutrients and coconut water might have given some force for uptaking nutrients from soil.…”

Determination of Grain Yield Inputs of the Maize Hybrid Giza 168 Using a Six-Factor Central Composite Design in Mediterranean Regions Under Irrigation

“…That may be explained by the growing conditions of the maize in this study where maize was grown under irrigation scheduling to ensure that no water deficit was encountered during the key growth stages of the plant. Higher irrigation levels, especially under Mediterranean conditions where incidence of drought can be expected, increased grain yield and its components (Nejad et al, 2010;Dahmardeh, 2011 andZare et al, 2014). Asharf et al (2016).…”

“…Hence, determination of water requirements is necessary to avoid either the drastic effects of drought or excessive irrigation on plant growth and productivity. Several studies have reported that shortening irrigation intervals (higher irrigation levels) resulted in higher grain yields relative to longer irrigation intervals, which can result in drought stress, especially at critical stages of growth such as grain-filling stage (Dahmardeh, 2011;Hammad et al, 2012;Zare et al, 2014 andAshraf et al, 2016). Interactions between irrigation and N level have also been reported.…”

Modelo estadístico para la predicción del rendimiento de grano en maíz

“…En maíz de secano, el rendimiento se redujo hasta un 13% en ausencia de K en un año (Subedi y Ma, 2009). En estrés por sequía, la aplicación de K en comparación con el control causó el aumento del rendimiento de grano, el peso de 1 000 granos y el número de granos por mazorca en 16.5, 9.0 y 5.5%, respectivamente (Zare et al, 2014). Las parcelas tratadas con K tuvieron un mejor rendimiento que el control en términos de mejor crecimiento, mayor rendimiento y mejoría en los componentes del rendimiento; al aumentar la dosis de K aplicado hasta 90 kg de K ha -1 en dos fracciones iguales, mejoró el crecimiento y la productividad del maíz en climas semiáridos (Amanullah et al, 2016).…”

“…El K representa al catión que es absorbido en mayor cantidad por las plantas, las gramíneas son conocidas como acumuladoras de K (Alcántar-González et al, 2016). Bajo estrés por sequía, la pulverización de K y hierro (Fe) podrían reducir tal estrés en maíz (Zare et al, 2014). La aplicación foliar de 1-3% y 0.1-0.2% de K y Zn respectivamente, fue más beneficiosa en condiciones limitadas de riego y en etapa vegetativa dio como resultado un mejor crecimiento y un mayor rendimiento (Amanullah et al, 2016).…”