3.2. Tomato quality
Organic manure, irrigation level and their interaction affected
tomato quality significantly (Table 2). Under 60–70%f, VMincreased vitamin C (VC) content by 8.22, 59.22, 15.17 and 80.26%
when compared with CM, HM, CF, and CK, respectively (Fig. 2).
The VC content in VM was lower than that of CM, HM and CF, and
still higher than that of CK under low and high irrigation levels.
The soluble solids in VM were lower than those of CM, HM and
CF, but slightly higher than those of CK under the three irrigation
levels (Fig. 2). The total acidity in VM was lower than that in the
other fertilizer treatments under low and medium irrigation levels.
However, VM had higher total acidity thanHMand CK, and still
lower than CM and CF under the high irrigation level (Fig. 2). The
sugar/acid ratio inVMwassignificantly higher than that in the other
fertilizer treatments under the low irrigation level, but lower under
70–80%f (Fig. 2). Under 60–70%f, VM decreased the sugar/acid
ratio by 27.25 and 16.68% compared to CM and HM, but increased
it by 7.96 and 26.85% when compared to CF and CK, respectively.
Mediumirrigation level had higher Vc content and soluble solids
than the low and high irrigation levels under various fertilizer treatments
(Fig. 2). The change trend of total acidity and the sugar/acid
ratio in different irrigation levels varied with the fertilizer treatment.
For VM, the contents of soluble solids and total acidity
increased with the increasing irrigation level, and the increment
of total acidity was greater than that of soluble solids, thus VM had
lower sugar/acid ratio with higher irrigation level.
3.2. Tomato qualityOrganic manure, irrigation level and their interaction affectedtomato quality significantly (Table 2). Under 60–70%f, VMincreased vitamin C (VC) content by 8.22, 59.22, 15.17 and 80.26%when compared with CM, HM, CF, and CK, respectively (Fig. 2).The VC content in VM was lower than that of CM, HM and CF, andstill higher than that of CK under low and high irrigation levels.The soluble solids in VM were lower than those of CM, HM andCF, but slightly higher than those of CK under the three irrigationlevels (Fig. 2). The total acidity in VM was lower than that in theother fertilizer treatments under low and medium irrigation levels.However, VM had higher total acidity thanHMand CK, and stilllower than CM and CF under the high irrigation level (Fig. 2). Thesugar/acid ratio inVMwassignificantly higher than that in the otherfertilizer treatments under the low irrigation level, but lower under70–80%f (Fig. 2). Under 60–70%f, VM decreased the sugar/acidratio by 27.25 and 16.68% compared to CM and HM, but increasedit by 7.96 and 26.85% when compared to CF and CK, respectively.Mediumirrigation level had higher Vc content and soluble solidsthan the low and high irrigation levels under various fertilizer treatments(Fig. 2). The change trend of total acidity and the sugar/acidratio in different irrigation levels varied with the fertilizer treatment.For VM, the contents of soluble solids and total acidityincreased with the increasing irrigation level, and the incrementof total acidity was greater than that of soluble solids, thus VM hadlower sugar/acid ratio with higher irrigation level.
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