Can Soil Compaction Alter Morphophysiological Responses and Soybean Yield under Application of Selective Herbicides?

Table 6

ANOVA summary ( + CV) and mean results for evaluations of plant stand (PS), plant height (PH), number of pods per plant (NPP), thousand-grain mass (TGM), and grain yield (GY) of soybean as a function of soil physical condition and herbicide applications in preemergence.

Sources of variation	DF
		PS (%)	PH (cm)	NPP (μd)	TGM (g)	GY (kg·ha^−1)
Block	5	0.23^ns	5.37	2.11^ns	1.09^ns	0.77^ns
Physical condition of the soil (C)	1	10.46	0.74^ns	0.01^ns	49.30	4.91^ns
Herbicides (H)	7	1.96^ns	1.30^ns	0.34^ns	0.68^ns	1.06^ns
C versus H	7	0.84^ns	1.74^ns	1.49^ns	0.27^ns	0.17^ns
CV 1 (%)		30.5	16.9	37.9	6.0	39.5
CV 2 (%)		13.6	9.8	33.0	4.9	14.8
Physical condition of the soil
Compacted		75.16 b	84.5	36.4	147.4 b	3,240.2
Noncompacted		92.0 a	87.1	36.2	160.7 a	3,876.9
Treatments	Dose (g ha^−1)
Control		76.9	87.1	35.8	153.1	3,775.4
Clomazone	800	78.5	86.4	35.3	152.7	3,732.7
Diclosulam	29.4	84.4	88.9	37.2	153.8	3,421.5
Flumioxazin	60	85.3	81.4	33	156.1	3,377.9
S-metolachlor	1,440	89.9	81.7	38.5	156.9	3,653.8
[Imazethapyr + flumioxazin]	[106 + 50]	87.5	87.4	39.4	152	3,564.6
[Pyroxasulfone + flumioxazin]	[90 + 60]	79.8	87.8	36	155.2	3,573.2
[Sulfentrazone + diuron]	[210 + 420]	86.1	85.7	35.2	152.7	3,369.2

DF: degree of freedom. ^{ns and}Nonsignificant and significant by F-test (), respectively. Mean values followed by different uppercase letters, in the same row, and lowercase letters, in the same column, are significantly different by the LSD-Fisher test ().