Straw Mulching with Minimum Tillage Is the Best Method Suitable for Straw Application under Mechanical Grain Harvesting
Table 2
Maize yields and harvest indices under different practices of crop straw application.
CNSA
Treatments
Kernel yield (t/ha)
Biomass (t/ha)
Harvest index (%)
Theoretical yield (t/ha)
1
Straw returns
SDBP
11.46 ± 0.50a
21.12 ± 0.86a
52.96 ± 0.68a
12.76 ± 0.61a
SSBRT
10.64 ± 0.47b
20.07 ± 0.82b
53.65 ± 1.43a
12.30 ± 0.62a
SMMT
9.04 ± 0.27c
18.11 ± 0.74c
54.31 ± 1.02a
11.22 ± 0.56b
Cultivars
BY9
10.80 ± 0.43a
20.56 ± 0.87a
54.72 ± 1.12a
12.81 ± 0.66a
JY99
9.96 ± 0.39b
18.97 ± 0.74a
52.55 ± 0.96b
11.37 ± 0.53b
Interaction
BY9×SDBP
11.53 ± 0.56a
21.58 ± 0.87a
53.03 ± 0.95bc
13.05 ± 0.65a
BY9×SSBRT
11.16 ± 0.49a
21.47 ± 0.87a
54.72 ± 1.64ab
13.40 ± 0.76a
BY9×SMMT
9.72 ± 0.25b
18.62 ± 0.87bc
56.41 ± 0.77a
11.97 ± 0.57bc
JY99×SDBP
11.39 ± 0.43a
20.66 ± 0.85ab
52.89 ± 0.40bc
12.46 ± 0.56ab
JY99×SSBRT
10.12 ± 0.44b
18.67 ± 0.76bc
52.57 ± 1.21c
11.19 ± 0.47c
JY99×SMMT
8.36 ± 0.29c
17.59 ± 0.60c
52.20 ± 1.27c
10.47 ± 0.55c
3
Straw returns
SDBP
9.55 ± 0.29a
17.38 ± 0.56b
54.11 ± 1.28a
10.74 ± 0.39b
SSBRT
9.29 ± 0.35a
16.79 ± 0.72b
52.64 ± 1.24b
10.09 ± 0.60c
SMMT
9.53 ± 0.28a
18.50 ± 0.60a
54.06 ± 1.08a
11.43 ± 0.31a
Cultivars
BY9
9.80 ± 0.32a
18.58 ± 0.66a
55.41 ± 1.25a
11.74 ± 0.34a
JY99
9.10 ± 0.28b
16.53 ± 0.59b
51.79 ± 1.14b
9.76 ± 0.52b
Interaction
BY9×SDBP
9.83 ± 0.30ab
18.25 ± 0.50b
55.78 ± 1.17a
11.60 ± 0.20b
BY9×SSBRT
9.52 ± 0.36ab
17.47 ± 0.78bc
54.59 ± 1.28a
10.87 ± 0.63bc
BY9×SMMT
10.06 ± 0.30a
20.03 ± 0.71a
55.85 ± 1.31a
12.75 ± 0.20a
JY99×SDBP
9.26 ± 0.27bc
16.50 ± 0.61bc
52.44 ± 1.39ab
9.87 ± 0.58d
JY99×SSBRT
9.05 ± 0.33c
16.11 ± 0.66c
50.68 ± 1.20b
9.31 ± 0.56d
JY99×SMMT
9.00 ± 0.25c
16.97 ± 0.49bc
52.26 ± 0.84ab
10.11 ± 0.42 cd
Groups labeled with different letters were significantly different (). The ± sign is followed by the standard deviation. CNSA: cumulative number of straw returns.
