Effect of potassium humate appliction and irrigation water levels on maize yield, crop water productivity and some soil properties [electronic resources].

Includes reference.

An experiment was conducted to study the response of Maize to irrigation levels with or without potassium humate on yield and yield components of maize (Zea. mays L., cv. single cross) and soil properties after harvesting. Maize was sown at Giza Agricultural Research Station, Agriculture Research Center, Giza Egypt, during summer season of 2013. The experiment was arranging spilt plot design with three replications. The experiment involved two factors, potassium humate (0, 5, 10 and 15 kg fed-1) allotted to main plots and irrigation levels (100%, 75% and 50% of field capacity) allocated in sub plots. The results showed among irrigation levels treatments, W1 recorded the highest values of all studied traits of maize plants included plant height, shoot diameter (em), Length of Ear (cm), No. of rows ear-1, weight of 100 grain (g), dry shoot (kg/ fed.), grain yield (kg/fed.) and biological yield (kg/fed.) and harvest index (HI%) .. Likewise, N, P, K, Fe, Mn and Zn content and its uptake showed the same trend. On the other hand, water stress resulted in a significant decrease in these parameters. Concerning water use efficiency, the highest values were achieved with irrigation level (W1) compared to the other irrigation levels (W2 and W3). Results also illustrated that plants received 15 kg fed-1 potassium humate produced the highest values of the corresponding parameters than those in the control. keywords: irrigation levels, Potassium humate, properties' soils, Maize crop.

Summary in Arabic.

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