イランにおける小麦および水稲栽培のエネルギー収支

The energy use of wheat and rice cultivation was investigated during 1978 in Iran. The number of investigated farms of the former was 27plots in six provinces and that of latter was 7plots in two provinces. The input-energy of wheat cultivation and grain yield ranged from 0.5 to 1.1x10⁶kcal/ha and from 0.5 to 4.2 ton/ha，respectively. The grain yields of wheat could be shown to have a parallel relation to the logarithm of the input-energy. High-yielding farms of 2 ton/ha in both methods of traditional agriculture，dryfarming and qunart-irrigation，had six as the maximum value in the energy ratio (ER: output-energy as grain yield/input-energy of cultivation). However，pumpirrigation with chemical fertilizer，harvesting high yields from 2 to 4.2 ton/ha，showed low ratios from 1 to 2.5 in the ER. In the case of rice，yields were 0.4-2.25 ton/ha of unhulled rice and the ER ranged from 1 to 6 over the 7plots. The ER of the Ahvaz area，as a low-yielding area with extensive agriculture，varied widely from 1 to 6. On the other hand，that of the Esfahan area，as a high-yielding area with relatively intensive agriculture，was around 2.4.