الاستهلاك المائي التجميعي لمحصول الذرة البيضاء تحت أسلوب التناوب بملوحة مياه الري و مستويات رطوبة التربة

الملخص EN

This research was conducted in agricultural researches station , agriculture college , Basrah university during season of 2004 - 2005.

the soil samples were taken from Al-Hammar marsh which located near the Al-Ghmage river.

The soil texture is silt loam and it is classified under Varity of Typic torrifluvents calcareous mixed hyperthermic.

The experiment was carried out in plastic columns to determine the effect of three irrigation saline water levels, three moisture levels on water use efficiency and growth of the sorghum crop.

The irrigation water type were river water (R),drainage water (D) and mixture of river and drainage water (M) .

The electrical conductivity of irrigation water treatments were 2,8 and 4 dsm-1 respectively.

The leaching requirement water of 25% from this water was added for each treatments of the irrigation time .

The experiment columns were divided into two parts: The first was planted with sorghum crop variety (sorghum bicolor); while the second was unplanted.

The first part of the experiment includes nine irrigation water scheduling treatments according to the crop growth stages (seedling emergence and developmet,tillering and flowering ).

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The second part of the experiment includes three quality of irrigation water R, M and D which were added to the bare soil at three periods of time equal to the period of the plant growth stages in the first part of the experiment.three moisture contents were chosen according to the field capacity, which were denoted 50, 75 and 100% of the field capacity.

There are an increase in accumulation consumptive water use, plants length and dry weight of the vegetable part of the plant for the RRR, DMR and MMM treatments compared with the other treatments.

Accumulation evaporation in soil unplanted were higher for the R treatment than the M and D treatments.The above parameters were higher for the 100% FC moisture treatment than the 50 and 75 % FC treatment.