Table 2.

Mean predicted increases in wet-season rice harvest in response to reductions in ABCs and GHGs

Hypothetical change	Time period	Means, %	H0
Both ABCs and GHGs reduced, with impacts on both yield and area	1966–1984	6.18	Reject (P < 0.01)
	1985–1998	14.4
Only ABCs reduced, with impacts on both yield and area	1966–1984	3.94	Reject (P < 0.01)
	1985–1998	10.6
Only ABCs reduced, with impact on only yield	1966–1984	0.97	Fail to reject (P = 0.45)
	1985–1998	2.09

Predictions refer to a representative rainfed rice-growing region in India and are drawn from Fig. 3. Means tests were conducted using two-tailed t tests with unequal variances for the two time periods. For H₀, means are equal for the two periods.