Fertilization and Colors of Plastic Mulch Affect Biomass and Essential Oil of Sweet-Scented Geranium

Table 1

The effect of different colors of plastic mulch and fertilizers on content and yield of sweet-scented geranium essential oil.

Fertilizer	Colors of plastic mulch
	Control	White	Black	Silver-colored
	Essential oil content (%)
Control	1.30^aA	1.42^aA	0.87^aA	1.16^aA
Cattle manure	1.32^aA	1.51^aA	1.15^aA	0.96^aA
NPK 3-12-6	1.23^aA	1.14^aA	1.16^aA	1.26^aA
Cattle manure + NPK 3-12-6	1.30^aA	1.25^aA	1.08^aA	1.16^aA
	Essential oil yield (mL·plant^−1)
Control	0.32^aA	0.49^aA	0.26^aA	0.52^aA
Cattle manure	0.21^aB	1.04^aA	0.42^aB	0.59^aB
NPK 3-12-6	0.21^aA	0.71^aA	0.45^aA	0.62^aA
Cattle manure + NPK 3-12-6	0.18^aB	1.02^aA	0.64^aB	0.97^aA

Lowercase letters indicate differences within columns, and uppercase letters indicate differences within rows. Values followed by the same letter are not statistically different based on the Scott-Knott test (𝑃≤0.05).