The efficacy of chemical topping in field-grown cotton is mediated by drip irrigation amount in irrigated agricultural area

Table 1 Significance (P-values) of drip irrigation amounts and MC_EW effects and their interactions on gas exchange parameters at different growth stages in 2014

Source of variance	Peak flowering stage				Peak boll stage				Boll opening stage
Source of variance	Pn	Gs	Ci	Tr	Pn	Gs	Ci	Tr	Pn	Gs	Ci	Tr
Drip irrigation (I)	< 0.001	< 0.001	< 0.001	< 0.001	< 0.001	0.626	< 0.001	< 0.001	< 0.001	0.390	< 0.001	< 0.001
MC_EW rate(MC)	0.003	0.001	0.292	< 0.001	0.166	0.001	0.083	< 0.001	0.060	0.019	< 0.001	0.12
I × MC	0.026	0.060	< 0.001	< 0.001	< 0.001	< 0.001	< 0.001	< 0.001	< 0.001	0.009	< 0.001	< 0.001

MC_EW represents a 25% mepiquat chloride emulsion in water; Pn, Gs, Ci, and Tr represent the net photosynthetic rate, stomatal conductance, intercellular CO₂ concentration, and transpiration rate, respectively

ISSN: 2523-3254