Interactions between potassium and boron were investigated on a pseudomyceliar (calcareous) chernozem soil at the Experimental Station of RISSAC in Nagyhörcsök in 1990, in the 3rd year of an experiment involving spring rape. Basic fertilization was applied at rates of 100 kg each of N and P2O5 per hectare. The K levels were 0, 1000 and 2000 kg•ha-1 K2O and the B levels 0, 20, 40 and 60 kg•ha-1, applied in autumn 1987 after the forecrop, alfalfa. The fertilizers were applied in the form of calcium ammonium nitrate, superphosphate, 60% KCl and 11% Na2B4O7× 10H2O (borax). The three K levels formed the main plots and the four B levels the sub-plots, giving a total of 12 treatments in 3 replications on a total of 36 plots, arranged in a split-plot design. The ploughed layer contained around 5% CaCO3, 3% humus and 20-22% clay. The soil was originally satisfactorily supplied with N, Ca, Mg, Mn and B, with moderate supplies of K but only relatively poor supplies of P and Zn. The groundwater was located at a depth of 13-15 m and the area was prone to drought. During the 130-day vegetation period, the spring rape received 244 mm rainfall, in addition to which the top 1 m of soil contained an estimated 126 mm of water when the crop was sown. This total of 370 mm water was sufficient to supply the water demands of a good to moderate yield. However, the drought during ripening in August hindered seed formation. The main conclusions were as follows: - The K and B treatments had no influence on the development or yield of rape. The stem, pod and seed yields at harvest amounted to 7.6, 1.9 and 1.0 t•ha-1. On the untreated soil the N, P, K, Ca, Mg, Mn, B and Cu concentrations in the shoot at the rosette stage were in or close to the optimum range given in the literature. - After fertilization with borax the B content of the vegetative organs of spring rape doubled on averaged by the third year of the experiment. K fertilization increased the K content of the vegetative organs, while lowering the concentrations of Ca, Mg and B due to ion antagonism. The K-Mg antagonism was especially pronounced. The K/Mg ratio rose from 8 on the K control soil to around 14 in the roots, from 10 to 17 in the shoots and from 16 to 28 in the stem. - The total 10.6 t•ha-1 aboveground biomass at harvest accumulated 245 kg K, 236 kg N, 121 kg Ca, 35 kg Na, 26 kg P and 19 kg Mg. These data could be utilized by the extension service when estimating the nutrient requirements of spring rape.
|Translated title of the contribution||Study on interactions between potassium and boron in spring rape|
|Number of pages||12|
|Journal||Agrokemia es Talajtan|
|Publication status||Published - Dec 1 2011|
ASJC Scopus subject areas
- Agronomy and Crop Science
- Soil Science