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Soybean Agronomic Performance Does Not Change with Gypsum Application in a Cambisol Submitted to Water Restriction in Southern Brazil

Open Journal of Agricultural Research | Vol 1, Issue 1

Table 2. Changes in soil nutrient availability as a function of agricultural gypsum management and the soil water conditions in four evaluated layers of a Cambisol.

Soil depth (cm)		Soil chemical properties
S-SO₄^2- (mg dm^-3)
	----Gypsum----			----Water restriction----
	without		With	Without	With	Mean
0-10	24.41^ns		29.79	26.08^ns	28.12	27.10 b
10-20	27.70 B		46.39 A	33.14^ns	40.95	37.05 a
20-30	31.39 B		44.73 A	39.60^ns	36.53	38.06 a
30-40	28.39 B		45.01 A	33.21^ns	40.19	36.70 a
Mean	27.97		41.48^*	3301^ns	36.45
CV (%)	24.40
K (mg dm^-3)
0-10	249.20^ns		233.50	276.18 A	206.50 B	241.34 a
10-20	127.16^ns		132.12	139.80^ns	119.55	129.65 b
20-30	91.00^ns		95.15	91.41^ns	94.44	93.00 bc
30-40	90.35^ns		81.55	85.25^ns	86.59	85.93 c
Mean	139.42^ns		135.58	148.16^*	126.77
CV (%)	27.70
Ca (cmol_c dm^-3)
0-10	10.09^ns		10.28	9.60^ns	10.77	10.18 a
10-20	6.30 B		8.34 A	8.05^ns	6.59	7.32 b
20-30	2.50^ns		2.87	2.96^ns	2.40	2.68 c
30-40	1.35^ns		1.78	1.85^ns	1.28	1.56 c
Mean	5.06		5.82^*	5.62^ns	5.26
CV (%)	21.74
Mg (cmol_c dm^-3)
0-10	5.72^ns		5.36	5.19 A	5.88 A	5.54 a
10-20	4.61^ns		5.16	5.01 A	4.76 A	4.88 a
20-30	2.34^ns		2.63	2.59 A	2.38 A	2.48 b
30-40	1.36^ns		1.76	1.82 A	1.30 A	1.56 c
Mean	3.51^ns		3.72	3.66^ns	3.58
CV (%)	18.81
P (mg dm^-3)
0-10	18.72 B		22.61 A	20.99^ns	20.33	20.66 a
10-20	6.34^ns		6.76	8.18^ns	4.92	6.55 b
20-30	4.24^ns		6.22	5.59^ns	4.87	5.23 b
30-40	2.76^ns		3.94	3.64^ns	3.07	3.35 b
Mean	8.01		9.88^*	9.60^ns	8.30
CV (%)	36.67

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