Abstract

Organic matter is a fundamental in soil, but dynamic component of soils that influences the many chemical, physical and biological properties that regulate soil productivity. Objective of using humic substances in plant is to balance vegetative and reproductive growth as well as to improve herbage and protein yield. This study has been carried out at the experimental area of the Field Crops Department of Dicle University, Agricultural Faculty in 2005 to 2006, to determine the effects of different humic acid treatments (Control, Soil 100%, Seeds 100%, Leafs 100%, Soil 50%+Seeds 50%, Soil 50%+ Leafs 50%, Seeds 50%+Leafs 50% and Seeds 33%+Soil 33%+Leafs 33% fertilizations) on yield and yield performances of common millet. According to results of the study, humic acid treatments raised the yield and yield components, and this raising was found to be significant statistically. The highest value for plant heights, bunch lengths, grain yields, 1000 grain weight, crude protein concentrations and grain number per bunch were obtained from leafs (100%) fertilizations and the highest hectoliter weight was obtained from seeds (100%) fertilizations.

Key words: Common millet, humic acid, fertilization, grain yield, crude protein.