2.2. Experimental methodThere were

2.2. Experimental method
There were three irrigation levels and five fertilizer treatments
in this study, totally 15 treatments (i.e. 3×5), and each treatment
was replicated four times. Three irrigation levels included
low irrigation (L, 50–60%f), medium irrigation (M, 60–70%f) and
high irrigation (H, 70–80%f). Five fertilizer treatments included
vermicompost (VM), chicken compost (CM), horse compost (HM),
chemical fertilizer (CF) and no fertilizer (CK). Warmcast, chicken
manure and horse manure were respectively composted with
crushed maize straw and rice chaff at the ratio of 1:1:1 to be
completely decomposed as vermicompost (VM), chicken-compost
(CM) and horse-compost (HM). The nutrient contents in various
manures/fertilizers were shown in Table 1. All treatments were
applied with 0.64 g N /kg soil, the amount of compost used according
to theirNcontent in Table 1 was 91.43, 54.23 and 53.33 g/kg soil
for VM, CMand HM, respectively. No other fertilizers were applied
in the three compost treatments. For chemical fertilizers treatment
(CF), N 0.64, P2O5 0.46 and K2O 1.0 g /kg soil were supplied as
urea, diammonium phosphate ((NH4)2HPO4) and potassium sulfate
(K2SO4), respectively. All chemical fertilizers were supplied
with analytical regents. All three composts, and half of N, P and
K fertilizers were added as basal fertilizer and evenly mixed into
the soil at the beginning of the experiment, and the other half of N,P and K fertilizers was added on 9 June (60 days after transplanting
(DAT), i.e. 60DAT).