Effect of leaching on soil properties and lucerne growth following lime and gypsum amendments to a soil with an acid subsoil
Black, A.S.; Cameron, K.C.
New Zealand Journal of Agricultural Research 27(2): 195-200
In pot trials in 1981-2, CaSO4 and Ca(OH)2 were applied at 0.86 or 2.58 g Ca2+/pot to A or B horizons of a Hororata very stony silt loam and either leached or left untreated before sowing lucerne cv. Rere in early Jan. Liming the A horizon had no effect on pH, exchangeable Al3+, the Al3+:Ca2+ ratio or root yield measured in mid-May in the B horizon. Liming the B horizon increased pH, reduced Al3+ and the Al3+:Ca2+ ratio and increased root growth in that layer. Effects of CaSO4 were small and root yields were unaffected. Shoot DM yields were significantly increased by soil amendment, the increase being significantly greater following application of Ca(OH)2 rather than CaSO4 to the B horizon.