AGRONOMIJAS VĒSTIS - Latvijas Lauksaimniecības universitāte

AGRONOMIJAS 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