000			02026cab a2200265Ia 45 0
001			u193155
003			SIRSI
008			110704s2008 ua ss b eng d
040			_aEAL
041			_aeng _bara
090			_aART MJAE V25 NO2 27
100	1		_aMosallam, M. A.
240	1	0	_aMisr Journal of Agricultural Engineering, 2008 v.25 (2),Special issue _h[electronic resource]: _bThe 15th. Annual Conference of the Misr Society of Agricultural Engineering :Agricultural Mechanization and Engineering Between Existing and Prospected:Egypt,12 -13 March,2008:Special issue.
245	1	0	_aEffect of three levels of ventilation on the production of hydroponic barley _h[electronic resource].
246	1	5	_aأثر ثلاثة مستويات من التهوية على إنتاج الشعير المزروع بغير تربة.
300			_ap.614-626.
504			_aIncludes references.
520			_aA wooden semi-controlled environment chamber was used to detect the effect of ventilation on the growth of hydroponic barley. Three successive experiments were carried out under three levels of powers of blowers: 1.7, 3.4 and 5W (each experiment corresponds to one level). In each experiment, three intensities of barley were used: 0.4, 0.8 and 1.2 kg/m2. Light intensity was 680 Lux and Photoperiod 24 hours. Plain water was used. The study ended to that: the blower 1.7W is preferable from both points of view: of productivity (mass) and this is for the intensity 1.2 kg/m2 and of specific mass (mass per unit mass) and this is for the intensity 0.4 kg/m2. The relation between power of blower and maximum specific mass for the intensity 0.4 kg/m2 is quadratic. The relation between relative humidity and power of blower is linear.
546			_aSummary in Arabic.
650		0	_aBarley _xSoils.
650		0	_aVentilation.
773	0		_tMisr Journal of Agricultural Engineering. _g2008.v.25(2) _x1687-384X _7nnas _wu192786
856	4	0	_uhttp://nile.enal.sci.eg/EALE/2008/MJAE/2508/2/614.pdf _zFull Text Article
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