Abstract
This study investigated the water use efficiency and yield for the production of green ears of corn subjected to irrigation with drip system and with potassium fertilizer levels in Sumé, Paraiba State, Brazil. The experimental design was a randomized design with four replications in a split plot design with six water slides (0.25 ETcp, 0.50 ETcp, 0.75 ETcp, 1.00 ETcp, 1.25 ETcp and 1.50 ETcp) and six doses of potassium (0, 20, 40, 60, 80 and 100 kg·ha-1). The maize hybrid AG 1051 was mechanically sown on 13/01/2012 and the spikes in the green stage (doughy grains) were harvested 67 days after planting. Water consumption for producing one ton of maize cobs in the slides 132, 264, 396, 528, 660, and 792 mm of water within all treatments of potassium fertilization increased, indicating that the WUE decreases with the increasing amount of water applied via irrigation. Therefore, it was observed that the water use efficiency average was 61.76 mm·t-1 (2.02 kg·m3), i.e. for each m3 of water used 2.02 kg of ears of corn were produced with default. The application of 680.64 mm of water and 72.14 kg·ha-1 potassium maximized the yield of ears, resulting in the maximum yield of ears of 10.82 t·ha-1.
Highlights
Maize (Zea mays L.) is a major cereal produced in the world and the most cultivated in Brazil, practically theHow to cite this paper: Dantas Junior, E.E. and Chaves, L.H.G. (2014) Yield and Water Use Efficiency of GreenMaize Planted in Conditions Brazilian Semiarid
Scientists from all over the world look to the studies correlated to water use efficiency (WUE) which is an important measure that shows the relationship between the unit dry matter produced and unit of water used
The factors, individually, affecting the productivity of spikes at 1% probability, and the interaction between water and potassium influenced this productivity at level of 5% statistical probability (Table 3)
Summary
Maize (Zea mays L.) is a major cereal produced in the world and the most cultivated in Brazil, practically theHow to cite this paper: Dantas Junior, E.E. and Chaves, L.H.G. (2014) Yield and Water Use Efficiency of GreenMaize Planted in Conditions Brazilian Semiarid. The cultivation of this cereal is well adapted to tropical and subtropical regions, [1] emphasized that the yield of corn in the northeastern region is low, because of the predominance of production systems that use little or no technology and there are usually, in this region, failure and irregular rainfall. Corroborating this idea [2] pointed out that the failure or irregular distribution of rainfall is a major factor limiting agricultural production in Brazil, yet occurred in recent years, a significant increase in the cultivation of maize under irrigation. For El-Hendawy [4] the water use efficiency through modern irrigation systems is increasingly important in arid and semi-arid regions with limited water resources
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