Doses and Timing of 2, 4-D Application for Broadleaf Weed Control, Botanical Compositions, Productivity, and Nutritive Value of Natural Pasture

Table 4

Effect of year, doses, and time of application of 2, 4-D herbicides and their interaction on plant height (cm), dry matter, and crude protein yield (t·ha⁻¹) of pasture land plant species.

Plant species	Parameters	Year	Doses (R)	Time (T)	R  T	R  Y	T  Y	Y  R  T	Mean	CV
Grasses	Dry matter yield	ns	ns	ns	ns				3.52	25.17
	Plant height	ns	ns	ns		ns	ns	ns	88.45	13.67
	Grass composition (%)	ns				ns	ns		66.54	25.71
Legumes	Dry matter yield		ns	ns					1.20	30.68
	Plant height		ns	ns	ns	ns	ns	ns	66.73	11.03
	Legume composition (%)	ns				ns	ns		18.51	21.64
Weeds	Dry matter yield					ns	ns	ns	0.50	32.55
	Plant height		ns	ns	ns	ns	ns	ns	51.63	19.59
Forage portion (grasses + legumes)	Dry matter yield	ns	ns	ns	ns		ns	ns	4.71	23.62
	Plant height		ns	ns		ns	ns	ns	77.59	9.16
	Botanical composition (%)					ns	ns		85.06	9.42
	Crude protein yield (t·ha^−1)		ns	ns	ns	ns	ns	ns	0.33	30.28
	IVDMDY	ns	ns	ns	ns		ns	ns	2.15	22.66

Y = year, R = doses of application, T = time of application, R  T = doses and time interaction, R  Y = Doses and year interaction, T  Y = time and year interaction, Y  R  T = year, doses and time interaction, ns = nonsignificant (),  = ,  = ,  = , CV = coefficient variation; forage portion = the average result of grass and legume.