تأثير مياه الري الممزوجة بمياه الصرف الصحي على إنتاجية محصول البرسيم و محتواه من العناصر الصغرى و السامة

Abstract EN

This study was conducted at Hada Al-Sham Agricultural Research Station, College of Meteorology, Environment and Arid Land Agriculture, King Abdulaziz University in Makkah Al- Mokarrama, to investigate the effects of five irrigation sewage water mixtures (0.0 % wastewater +100 % normal water, 25 % wastewater +75 % normal water, 50 % wastewater +50 % normal water, 75 % wastewater +25 % normal water and 100 % wastewater +0.0 % normal water) on green forage yield and yield components of Alfalfa, beside the contents of the plant leaves and stems of micronutrients and toxic elements.

The study was carried out during the four seasons of summer, spring of 2005 and autumn and winter of 2006.

The results showed that the summer season produced significantly higher values of plant height (67.98 cm), leaf area index (3.42 m2 / m2) and dry forage yield (13.46 t / ha) compared with the other seasons.

The irrigation treatment of (75 % wastewater +25 % normal water) led to significantly higher values of plant height (63.46 cm), leaf area index (3.00 m2 / m2), fresh green forage yield (52.39 t / ha) and dry forage yield (17.81 t / ha) as compared with the other irrigation treatments.

The lowest values of the studied agronomic traits were produced under the 0.0 % wastewater treatment (100 % normal water) with values of 59.92 cm, 1.57 m2, 40.37 t / ha and 4.92 t / ha for plant height, leaf area index, green forage yield and dry forage yield, respectively.

Winter season cuts produced plants with the higher significant values of micronutrients and toxic elements in their stems and leaves while summer season plants had the lowest values.

Irrigation with 100 % wastewater produced plants containing the highest significant values of micronutrients and toxic elements in both stems and leaves and gradually decreased as wastewater in irrigation water decreased.

The toxic elements in leaves and stems of alfalfa were in the critical level with all wastewater irrigations and this dangerous critical level was more pronounced with increasing wastewater percentage in irrigation water.