Effect of nitrogen on wheat yield different levels of phosphorus supply in soil
2000
Malesevic, M. (Naucni institut za ratarstvo i povrtarstvo, Novi Sad (Yugoslavia)) | Marinkovic, B. | Starcevic, Lj. | Bogdanovic, D.
In the period 1993-1998, 12 wheat genotypes from various breeding cycles were studied. The selected genotypes differed in yield potential, grain quality and vegetation period. Experiments were conducted in a stationary trial with different NPK variants, which had been established in 1965 on a chernozem soil. The tested varieties differed in the reaction to the variants of NPK fertilization. The varieties had maximum yields at different N:P:K ratios. Most varieties brought maximum grain yields with 100 kg/ha. However, when the content of P2O5 was below 10 mg/100 g of soil, the average yields were 1.96 t/ha lower in spite of 100 kg/ha N added. The earlier genotypes performed better than the later ones in conditions of P2O5 shortage. The differences in yield performance were mostly due to a smaller number of grains per spike in the variants with low phosphorous. K2O did not affect significantly the grain yield performance of the tested varieties because its content in the soil, although it was not added for 30 years, still remained above the minimum wheat requirement for this element.
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