Rit Landbúnaðardeildar : B-flokkur - 01.12.1961, Blaðsíða 8

6
Tafla 2. Áhrif fosfóráburðar á fosfórupptöku vallarfoxgrass. Magn af köfnun-
arefni og kali eins í öllum pottum, samsvarandi 150 kg N og 100 kg KsO á ha.
The effect of phosphorus on phosphorus uptake by timothy. The rate of nitrogen and potash
application was identical for all pots, corresponding to 150 kg N and 100 kg K2O per hectare.
1. 2. 3. 4. 5. 6.
Jarðvegstegund og tilraunaár kind of soil and experimental season Áburðarmagn mg P/pott fertilizer mg P/pot A mg Meðaluppsk. g þurrefni/pott average yield g dry matter pr. pot % P í þurrefni grass per cent P in dry matter of grass Upptaka fosfórs mg P/pott phosphorus 1iptake mg P/pot B mg „Fosfórjafnvægi“ „apparent phosphorus balance" B/A x 100% % af B komu frá sams.-áburði percentage of B supplied by the seasons fertilizer % af A eru tekin upp samsum. per cent of A taken up in sea- son of application
Móajarðvegur 1957 82,81) 21,0 0,10 21,0 25,4 53 13,4
frá Núpum 1958 — 20,4 0,12 24,5 29,6 61 18,0
silt loam 1959 — 13,1 0,12 15,7 19,0 48 9,2
soil 1960 — 13,4 0,15 20,1 24,3 59 14,5
Meðaltöl averages 17,0 0,122 20,4 24,6 55 13,8
Sami 1957 124,2!) 22,2 0,11 24,4 19,7 55 10,7
jarðvegur 1958 — 22,4 0,15 33,6 27,0 51 13,7
same 1959 — 14,9 0,14 20,8 16,7 34 5,6
soil 1960 — 15,1 0,18 27,2 21,8 62 13,6
Meðaltöl averages 18,7 0,145 26,5 21,3 51 10/9
Sami 1957 165.61) 23,2 0,11 25,6 15,5 62 9,5
jarðvegur 1958 — 22,7 0,15 34,0 20,5 52 10,7
same 1959 — 18,0 0,14 25,2 15,2 35 5,3
soil 1960 — 18,0 0,18 32,4 19,6 72 14,0
Meðaltöl averages 20,5 0,145 29,3 17,7 55 9,9
Mýri úr 1957 82,8 18,8 0,11 20,7 25,0 50 12,6
Ölfusi 1958 — 7,5 0,20 14,6 17,6 45 8,3
peat 1959 — 20,4 0,12 24,5 29,6 42 12,3
soil 1960 — 17,1 0,14 24,0 29,0 57 16,5
Meðaltöl averages 16,0 0,143 20,9 25J 49 12,4
!) 82,8 mg P/pott samsvarar 60 kg P^Os/ha
124,2 — — — 90 ~ —
165,6 — - _ 120 — —