Izvorni znanstveni članak
The influence of residual fertilizing by phosphorus and potassium upon sugar beat root yield and some soil chemical properties in crop rotation maize-soybean-winter wheat-sugar beat
Anđelko Butorac
Jasminka Butorac
Ferdo Bašić
Milan Mesić
Ivica Kisić
Sažetak
Residual fertilization with phosphorus and potassium was investigated on sugar beet grown in two rotations within the four-year field crop rotation. The several years long trial was set up on luvic soil on redeposited loess at the locality Lukač (Virovitica). Besides the unfertilized variant and standard mineral fertilization, the trial also included two variants of residual fertilization for a four-year period and one variant for a two-year period, naturally with different sources of phosphorus, and partly also potassium.
As regards its root yields, sugar beet responded favourably to residual fertilization with phosphorus and potassium, in which potassium indisputably played the key role. It was found that triplex and potassium salt had an advantage, though only relative, over complex fertilizer.
According to average several-years values, increase of plant available phosphorus and potassium content in the soil was not proportional to their quantities applied, though it was more significant for potassium. Nonetheless, this increase was significant in some years due to phosphorus-potassium fertilization. In a relative sense, mainly the base saturation of the cation exchange capacity was reduced compared to the control. Under the influence of phosphorus-potassium fertilization, very heterogeneous values were recorded in particular trial years.
Ključne riječi
residual fertilizing by phosphorus and potassium, sugar beet root yield; soil chemical properties, crop rotation
Hrčak ID:
2212
URI
Datum izdavanja:
10.2.2005.
Posjeta: 2.528 *