بينت الدراسة أن متوسط الكثافة الظاهرية للتربة في العمق 20-0 سم بلغ 1.04 غ / سم3 في المعاملة من دون ضغط، و قد ازدادت هذه الكثافة معنوياً مع زيادة الضغط و الرطوبة في أثناء الانضغاط، و كان معدل الزيادة الأكبر في العمق 0-20 سم حيث بلغت الزيادة 0.38 غ/سم3 عند الضغط 257.44 كيلو باسكال، و متوسط الرطوبة في أثناء الضغط 19.03% مقارنة بالمعاملة من دون ضغط. كما أن حجم المسامات أكبر من 50 ميكروناً انخفض عند الضغط السابق نفسه، و متوسط الرطوبة السابقة في العمق -0 20 سم بمقدار 20.02%. و انخفض حجم المسامات أكبر من 10 ميكرونات بمقدار 20.65% مقارنة مع المعاملة من دون ضغط. و لوحظ أن الانخفاض الأكبر في الإنتاجية كان عند معاملة الضغط 257.44، و رطوبة 21.8؛ إذْ بلغ الانخفاض في الإنتاج 17.52%. كما تم التوصل إلى أن الكثافة الظاهرية المثالية في الطبقة السطحية من 20-0 سم لإعطاء أفضل إنتاجية من الشوندر السكري كانت 1.12 غ/سم3، و كانت القيمة الحدية 1.28غ/سم 3.، و التي بعد تجاوزها يحصل انخفاض معنوي في الإنتاج.
The study has shown that the apparent bulk density of soil increases with the increase
of compression and moisture during press. The maximum rate of increase in depth was 0 –
20 cm that amounted 0.38g/cm3 at compression by 257.44-kilopascal and moisture
average at compression by 19.03% (equal to 60% of the field capacity average of the soil)
in comparison with the non-existence of compression. In addition, the size of the pores
bigger than 50 microns decreased at the same above compression and above moisture in
depth of zero – 20 cm by 20.20%. The size of pores bigger than 10 microns decreased by
20.65% in comparison with the non-existence of compression. While it was noted that the
the maximum loss of root yield that amounted 17.52%, at compression by 257.44
kilopascal, and moisture 19.03%.
References used
Abu-Hamdeh, N.H.( 2003): Compaction and sub soiling effects on corn growth and soil bulk density. Soil Science Society of America Journal 67(4), 1213–1219
Alakukku, L., Elonen, P.,( 1995): Long-term effects of a single compaction by heavy field traffic on yield and nitrogen uptake of annual crops. Soil Till. Res. 36, 141– 152
Czeratzki,W. (1972) : Die AnsprÜche der Pflanzen an den Physikalischek Bodenzustand .Land bauforschung.VÖlkenrode 22. Germany. p.29-36
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