[Sugar beet response to NPK in long term field experiments with fertilizers on chernozem soils in Romania]
1999
Dumitru, M. | Borlan, Z. | Stefanescu, Daniela (Institutul de Cercetari pentru Pedologie si Agrochimie, Bucuresti (Romania))
Factorial NPK long term field experiments with fertilizers in appropriate crop rotations on 8 rainfed and 7 irrigated chernozem soils were started in 1967-1968 aimed at disclosing fertilizer effect on yield of sugar beet in rotations with other field crop and on some soil chemical properties (pH, PAL, KAL). Along with usual Fisher's analysis of variance, the experimental data have been interpreted also according to Mitscherlich-Baule nutrient sufficiency concept considering yield regressions on both efficient nutrient supply from soil and on applied NPK as fertilizers. Based on yield regressions on both soil agrochemical properties and fertilizers applied (N: 0-160; P: 0-160 and K: 0-160 kg/ha year) formula have been established and used, to quantify: efficient N, P, K supplies from soil nutrient reserves; degrees of sugar beet nutrient sufficiency; economically sound rates (ESR) of N, P and K for maximising net profit per unit surface; optimal rates (ORSSSCP) of factory made (NPK) fertilizers aimed at stabilising soil chemical properties as a background for sustained crop productions; impact of ESR and of ORSSS on KAL in the ploughed layer; specific yield increases (kg of yield per 1 kg of N, P2O5, K2O) from applied fertilizers in ESR and ORSSSCP.
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