تأثير تسوية الأرض في المحصول و الإصابة بثاقبة القصب الصغرى في حقول قصب السكر في منطقة مصر الوسطى

الملخص EN

The direct effect of sugar-cane fields land leveling on the quantity of irrigation water, as well as, the indirect effects on C.

agamemnon infestation (l.J o/o and C.T%) at harvest time and cane and zugar yields were determined.

The economics of land leveling application were also calculated.

Results indicated that the irigption water quantity/Fed.

wasreducedby28.8,24.2atdl0.4o/ofortheheatnents oflaser leveling with slope of 3 cm /100 m., laser at zero level and manual leveling, respectively, as compared to the check .

All treatments of laser with slope, laser at zero level and manual leveling showedlowerlevels ofChilo infestation (I.J% andC.P/o),(3.18% and,7.83%), (5.05% and 10.67%) afi (6.57Yo and l4.67Yo), respectively.

The mean infestation level in the checkwassigrificantlyhigherthanall treatments (10.47% allrd 22.83o/o).

This apparentlyconfumtheindirecteffectoflandleveling onChilo infestationthroughregulatingthe irigation water quantity, hence reducing R.H.% wtrich has a direct effect on the pest activity in sugar-cane Iields.

kr addition to the advantages of reducing the quantity of irrigation waterandCiiloinfestationlevels,thelevelingofzugar-canefieldshaveagreateffecton increasig the net return ofcane and sugar yields