engleski

Alleviation of drought stress in maize by liming

Weather conditions, especially precipitation and temperature regimes, have important role in yield formation. For example, maize yields in Croatia in the least 15-year period (1993-2007) for three less favourable years (LFY: 2000, 2003 and 2007) were considerably lower than in three more favorable (MFY: 1997, 2002 and 2005) years (means 4.24 and 6.31 t/ha, respectively). Drought stress and the higher air-temperatures are main responsible factors of the lower maize yields in LFY. For example, precipitation in 3- months period June-August (Osijek Waether Bureau) was in LFY for 64 % lower than in MFY (means 110 mm and 304 mm, respectively). At the same time, air-temperatures were for 2.2 oC higher (means 22.9 and 20.7 oC, respectively). Alleviation of drought stress is possible by adequate soil management practice, especially by limig. For example, by using 45 t of carbocalk (waste of sugar factory) in autumn of 2000 (Sopje, Virovitica-Podravina County) resulted by maize yield increase under drought stress conditions of 2003 for 50% (6.63 and 4.42 t/ha, respectively). Also, by application of 5 t/ha of hydratized calcite (73% CaO + 2-3% MgO + 21% of bound water) (Podgorac, Osijek- Barannya County) maize yield under drought stress of 2007 was increased for 26% (5.97 and 7.55 t/ha, for control and 5 t/ha lime, respectively). Hydratized dolomite (47% CaO + 34% MgO) application in spring of 2005, increased maize yield in Gradiska area (RS, Bosnia & Herzegovina) for 43% (drought stress in 2007: 3.99 and 5.69 t/ha, for control and 10 t/ha of lime, respectively).

drought stress ; liming ; maize yield ; precipitation ; temperature

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