AGRONOMIJAS VÄSTIS - Latvijas LauksaimniecÄ«bas universitÄte

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<strong>AGRONOMIJAS</strong> VĒSTIS (Latvian Journal of Agronomy), No.10, LLU, 2008The acidification process was slowed down when manuring (60 t ha -1 ) every fifth year(Figure 2). Independently of the soil’s pH level, manure decreased soil pH by 0-0,2 and by – 0,3-0,4 units on average when fertilizing by N 45 P 39 K 57 and N 135 P 117 K 171 respectively.pH KCl unlimed1. y = 0,001x 2 - 0,0421x + 4,7426; r = 0,8465,52. y = 0,001x 2 - 0,054x + 4,8086; r = 0,823. y =0,0008x 2 - 0,0583x + 4,8625;r = 0,9354,543,50 5 10 15 20 25 30years after limingpH KCl pH 5,2-5,765,51.y = 0,001x 2 - 0,0421x + 4,7426; r = 0,842. y = 0,0023x 2 - 0,1098x + 5,5987; r = 0,983. y = 0,003x 2 - 0,1323x + 5,8843; r = 0,994. y = 0,0028x 2 - 0,1447x + 5,7373; r = 0,9954,543,50 5 10 15 20 25 30years after limingpH KCl1) Unlimed, unfertilized 2) Unfertilized76,565,554,54pH 6,2-6,71. y = 0,001x 2 - 0,0421x + 4,7426; r = 0,842. y = 0,0018x 2 - 0,1103x + 6,5361; r = 0,963.y = 0,0022x 2 - 0,1276x + 6,7126; r = 0,974. y = 0,002x 2 - 0,1477x + 6,7013; r = 0,993,50 5 10 15 20 25 30years after liming3) N45 P39 K57 4) N135 P117 K171Figure 1. The variation of pH KCl value as affected by various intensity mineral fertilizations,Vezaiciai, 1977 – 200544
<strong>AGRONOMIJAS</strong> VĒSTIS (Latvian Journal of Agronomy), No.10, LLU, 2008pH KCl65,5Unlimed + manure1. y = 0,001x 2 - 0,0421x + 4,7426; r = 0,842. y = 0,0007x 2 - 0,0353x + 4,736; r = 0,853. y = 0,0007x 2 - 0,0366x + 4,7603; r = 0,854. y = 0,001x 2 - 0,0611x + 4,8843; r = 0,9354,543,50 5 10 15 20 25 30years after limingpH KCl65,5pH 5,2-5,7 + manure1. y = 0,001x 2 - 0,0421x + 4,7426; r = 0,842. y = 0,0004x 2 - 0,0447x + 5,4299; r = 0,983. y = 0,002x 2 - 0,0964x + 5,7996; r = 0,994. y = 0,0029x 2 - 0,1392x + 5,7579; r = 0,9954,543,50 5 10 15 20 25 30years after limingpH KCl1) Unlimed, unfertilized 2) Unfertilized76,565,554,54pH 6,2-6,7+ manure1.y = 0,001x 2 - 0,0421x + 4,7426; r = 0,842. y= 0,0018x 2 - 0,1005x + 6,5272; r = 0,983. y = 0,0017x 2 - 0,1109x + 6,68; r = 0,974. y = 0,0016x 2 - 0,1161x + 6,6303; r = 0,983,50 5 10 15 20 25 30years after liming3) N45 P39 K57 4) N135 P117 K171Figure 2. The variation of pH KCl value as affected by various intensity mineral and organicfertilizations, Vezaiciai, 1977 – 200545
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