[Influence of potassium, magnesium, and sulphur fertilizers on ecologically cultivated perennial grasses]
2008
Pekarskas, J., Lithuanian Univ. of Agriculture, Akademija, Kauno reg. (Lithuania) | Spruogis, V., Lithuanian Univ. of Agriculture, Akademija, Kauno reg. (Lithuania)
Investigations carried out over the period of 2000-2005 on the ecological farm of the Center of Agroecology at the Lithuanian University of Agriculture have shown that fertilizing with a K90S51M300 rate of potassium magnesia increased the harvest of hay from 0.73 to 1.30 t haE-1 or 16.5 - 33.8 per cent, the amount of green proteins increased from 0.71 to 1.16, the amount of fats increased from 0.31 to 0.43. Fertilization with a K90S32.4 rate of potassium sulphate significantly increased the harvest of perennial herbage hay from 0.98 to 1.27 t haE-1 or from 23.7 to 32.9 per cent, while fertilization with K30S10.8 - K90S32.4 caused an additional increase in the amount of green proteins. Potassium magnesia and potassium sulphate did not have an essential influence on the amounts of green fibre and green ashes in perennial grasses. Investigation has determined that kieserite did not have any significant influence on the harvest of hay of perennial herbage, amount of green fats, fibre and ashes. However, it essentially increased the amount of green proteins in the hay of perennial herbage. Fertilizing with potassium magnesia and potassium sulphate increased the share of grasses in the botanical composition of perrenial herbage. However, it decreased the amount of legumes, while fertilization with kieserite had a contrary effect: it increased the amount of legumes and decreased the share of grasses.
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