Effect of soil structures and nitrogen nutrition on yield and yield components of Barley: utilization of δC13 as an indicator of water deficit

The objective of this study was to analyze the effect of combination between soil structures and nitrogen doses on the yield and its components. The treatments consisted of three soil structures: loose(O), block(B) and alternate between loose and compact(G) and five doses of nitrogen ranging from 0 to 200 kg/ha which were tested at TASS2, TASS3 and TASS4. Results showed that soil structures influenced nitrogen absorption and yield mainly through grain number/m2. The soil structure effect depends greatly on the climate. This study proved that carbon isotopic composition δC13 related greatly to the carbon and water nutrition of the plant, therefore it can be used as an indicator of water deficit. (author), 17 refs, 2 tabs, 7 figs