engleski

Influence of sugar beet fertilization with magnesium sulphate on root yields and quality

Satisfactory root yields and low sucrose contents characterize sugar beet production in Croatia. We studied about the possibility of improve sugar beet quality, especially sucrose contents, by application of MgSO4, because shortage of Mg could be a limiting factor of sugar beet root quality. Testing of sugar beet hybrids (total 19) were performed on three localities of eastern Croatia for the 1997 growing season. The field trials were conducted in eight replications. Each experimental plot measured 10 m2 (two 10-m rows). Four replications (total 228 plots) were treated with Epsom salt (5% MgSO4 . 7H2O solution ; 400 l/ha) two times in eight days interval (June 9 and June 17, 1997). The growing season 1997 was especially favorable for sugar beet growing. Epsom salt fertilization (ESF) significantly influenced on digestion (15.18% and 15.44%, for control and ESF, respectively), sugar beet root yields (55.16 and 57.38 t/ha, respectively), sugar yields (7.12 and 7.52 t/ha, respectively) and root K contents (3.83 and 3.95 mmol/100 g of root, respectively). However, sodium (Na) and amino-N contents were independent on ESF treatments. Differences among hybrids were in range from 14.81 to 16.00% (sucrose), from 49.48 to 60.54 t/ha (root yield) and from 6.18 to 8.23 t/ha (technological sugar yield), from 3.47 to 4.48 mmol/100g root (potassium), from 1.09 to 1.56 mmol/100g root (sodium) and from 2.00 to 2.96 mmol/100g root (amino-N). By our testing for the growing seasons 1995 and 1996, mean sucrose contents increased as affected by Epsom salt fertilization for 0.25% and 0.20%, respectively. Based on our 3-year experiences, we suggested foliar spraying of sugar beet with Epsom salt as usual crop management practice, especially on soils with moderate Mg supplies.

amino-nitrogen; magnesium sulphate; sucrose; sugar beet; yield

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