engleski

Liming influences on maize and sugar beet yield and nutritional status

The field trial with increased rates of air- dried carbocalk (waste of Osijek Sugar Factory ; 39% CaO) was conducted in autumn of 2000 on planosol in the amounts 0, 15, 30, 45 and 60 t ha-1. Liming considerably influenced on maize yields by increases up to 26% (4-year mean) with variation these effects among the years from 7% to even 50%. Yields of sugar beet were increased due to liming up to 43% (30 and 43 t ha-1, for 0 and 30 t ha-1 of lime, respectively). However, liming was closely related to lower sugar beet root quality (sucrose = 14.6% and 13.4%, amino-N = 2.62 and 4.58 mmol 100 g-1, for 0 and 60 t lime ha-1, respectively). By using 60 t carbocalk ha-1 significantly increased maize leaf P (+45%), Ca (+35%), Mg (+57%) and decreased K (-7%), Zn (-54%) and Mn (-71%) compared to the control treatment (3-year means). Analogical comparison for sugar beet leaf (the 2004 growing season only) resulted by differences as follows: P (+57%), Ca (-18%), Zn (-53%), Mn (-90%), B (-36%), and non-significant differences for K, Mg and Na. Mean concentrations of the nutrients in maize leaves found by our study were as follows: 0.344 % P, 2.42% K, 0.812% Ca, 0.332, mg Mg kg-1, 33.2 mg Zn kg-1 and 130.3 mg Mn kg- 1, respectively. Adequate concentrations of these elements were found in maize leaves with emphasis that by using 60 t of lime ha-1 concentrations of Zn were close to inadeaquate concentration of 20 mg Zn kg-1. Also, adequate ranges of sugar beet leaf P (mean 0.374% P), K (mean 3.99% K), Ca (1.23% Ca) and Zn (mean 24.5 mg Zn kg-1) were found. The levels of leaf B, Mg and Mn were out the adequate ranges (deficit of B: mean 7.4 mg B kg-1 ; oversupplies of Mg and Mn: means 1.18% Mg and 160 mg Mn kg-1, respectively).

carbocalk ; liming ; maize ; sugarbeet ; nutritional status ; yield

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