Ársrit Ræktunarfélags Norðurlands


Ársrit Ræktunarfélags Norðurlands - 01.01.1966, Side 61

Ársrit Ræktunarfélags Norðurlands - 01.01.1966, Side 61
64 Summary. In the summer of 1966 experiments with sulphur fertilizers were car- ried out on three locations in the North of Iceland. All the locations were permanent grass fields. Increasing rates of sulphur in gypsum and potassium were applied. In addition five different kinds of sulphur fertilizers were tried out (Gypsum, potassium sulphate, super phosphate, „25-15“ (mixed fer- tilizer 25% N and 15% P2Or) and magnesium sulphate). (See Table 1.) The results of the experiments showed that the above mentioned locations lacked sulphur. (See Table 2 and Table 3.) Sulphur in super phosphate yielded quite considerably less first cutting than did the same rate of sulphur in gypsum and potassium sulphate. However, super phosphate gave a considerable yield increase 11 Hkg/ha in the second cutting compared wúth a plot to which sul- phur fertilizers had not been applied. Maximum yield w'as obtained from 8 kg S/ha on two out of three locations. On the third location, however, the maximum yield was ob- tained from 16 kg/ha. Chemical analysis of cutting samples did not show any differences in concentrations of Ca. Mg, Na, K and P in spite of incraesing rates of sulphur fertilizer. (See Table 5.) Heimildaskrá. Árni Jónsson: Skýrslur Tilraunastöðvanna (1959—1960). Sami: Persónulegar heimildir. 1966. Gunnarsson O.: Svavel — ett aktuellt vaxtnaringsamne. Váxt — Nárings — Nytt. 14. (12—) 1958. Johansson O.: On sulplntr problems in Swedisli agriculture. Disputats. Kungl. Lantbrugshögsk. Ann. 25. (57—) 1959. Odelien M.: Orienterende markforsók med svævelgjpdsling. Forskning og forspk i landbruket 17 (79—116) 1966. Örn Þorleifsson: Persónulegar heimildir. 1966.
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