The efficiency of potassium fertilizers on the yield of agricultural crops and agrochemical properties of soils of different genesis
2003
Vaisvila, Z. (Lithuanian Univ. of Agriculture, Akademija, Kauno reg. (Lithuania)) | Matusevicius, K. | Arbacauskas, J. | Eitminavicius, L.
Fertilization experiments were carried out in crop rotation established on Epicalcari-Endohypogleyic Cambisols moraine sandy loam in Central Lithuania and on glacial lacustrine silty loam soil in Lower Nemunas. Plant available potassium in topsoil (O-20 cm) was 58 and 87 mg kg*[-1), and non-exchangeable potassium - 153 and 624 mg kg*[-1), respectively. It was found that potassium fertilization in combination with medium nitrogen and phosphorus rates essentially increased the yield of winter wheat, sugar beet, spring barley grain and annual grasses. However, use of potassium fertilizers on silty loam soil did not increase the yield of winter wheat and sugar beet. Crops grown in silty loam soil assimilated potassium better that those grown in sandy loam. After application of medium (109 kg ha*[-1)) potassium fertilizer rate, the amout of available potassium taken up by plants was 20 kg ha*[-1) lower in sandy loam soil and 20 kg ha*[-1) higher in silty loam, compared with the amount used with fertilizers.
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