Figures & data
Table 1. Mean soil organic matter (SOM), the total nitrogen (TN), the available phosphorus (AP), the available potassium (AK) and pH in the 0-20 cm soil layer among all the treatments after harvesting of late rice in 2018 (n=4)
Figure 1. The activities of soil invertase (a), urease (b), catalase (c), acidic phosphatase (d) and cellulase (e) among all treatments after harvesting of late rice in 2018 (Different letters in a figure mean significance among treatments at the 5% level, n=4)
Figure 2. The rice yields for early rice (a), late rice (b) and double rice (early rice and late rice, c) of these treatments as influenced by various amount of CMV applied from 2008 to 2018 (Different letters in a figure mean significance among treatments at the 5% level, n=11)
Table 2. CMV application rate at the maximum rice yield of double rice of each year calculated by unary quadratic equation with the coefficients of determination and the p values
Figure 3. Linear relationship between the year of CMV application and the rational amounts of CMV applied for maximum yield of double rice (n=11)
Table 3. The coefficient of yield variation (CV %) and the sustainable yield index (SYI %)of early and late rice as well as double rice in the double rice system (2008-2018, n=11)
Table 4. Fertilizer use efficiency for early rice, late rice and double rice, as influenced by various amount of CMV application in the double rice system (2008-2018, n=11)