تأثير إضافة كوالح الذرة المجروشة و التحضين في بعض الصفات الفيزيائية لتربة مزيجة رملية

الملخص EN

Laboratory experiment was conducted to investigate the influence of ground corn cobs and incubation on some physical properties of sandy loam soiL The experiment was carried of Soil Science Dept., College of Agriculture.

Plastic pots were filled with 2kg < 2 mm diameter soil and corn cobs were added at levels of 0,10, 20 and 40 g.

kg soiL Another materials which help in acclerate the decomposition were gypsum Calcium Sulfate (0, 1, 2, 4) g.

kg'1 soil, super phosphate fertilizer in a rate of 0.6 g.

kg soil and Urea fertilizer in a rate depending on C/N ratio of corn cobs and their rate at each soil treatment.

The experiment was done with three replicates in completely randomized design .

The soil pots were incubated at 30 ± 2 C with moisture content 80% of field capacity (33 kpa).

After 30 and 60 days of incubation soil samples were taken for study.

The results showed that the addition of corn cobs to soil affected physical properties.

It decreased bulk density, soil penetration resistance and aggregates water sorption.

It increased porosity and main weight diameter of soil aggregates.

The results showed that level of 80 tons, ha'1 and incubating for 60 days was best to give the best result.

The results of this study dearly showed that corn cobs can be used as organic matter source with high rate of decomposition if they are used with other materials facilitating the rate of break down of corn cobs.