Table 6 Biomass and harvest index of four rice cultivars grown four cultivation methods in main crop-ratoon rice system in 2017–2020.

From: Impact of tillage and crop establishment methods on rice yields in a rice-ratoon rice cropping system in Southwest China

Variable

Main season

Ratoon season

Total dry matter (g m−2)

Harvest index (%)

Total dry matter (g m−2)

Harvest index (%)

Treatment (T)a

CTDS

1767.0 a

52.9 c

654.6 a

42.8 c

NTDS

1748.6 a

53.2 c

660.9 a

43.2 bc

NTTP

1455.7 c

55.1 a

586.4 b

44.4 ab

CTTP

1524.5 b

54.2 b

603.1 b

44.7 a

Cultivar (c)b

HHZ

1581.2 c

54.0 a

600.4 b

42.4 c

JNSM

1474.1 d

53.4 b

544.9 c

45.7 a

N6Y103

1738.7 a

54.1 a

722.1 a

43.2 bc

RY1015

1701.8 b

53.9 ab

637.6 b

43.8 b

Year (Y)

2017

1884.0 a

53.4 b

763.9 a

47.4 a

2018

1581.1 b

53.4 b

576.4 c

42.6 c

2019

1488.3 d

53.1 b

629.2 b

41.0 d

2020

1542.4 c

55.6 a

535.6 d

44.1 b

Analysis of variance

Year (Y)

**

**

**

**

Treatment (T)

**

**

**

**

Cultivar (C)

**

*

**

**

Y × T

**

**

**

**

Y × C

**

**

**

**

T × C

**

*

ns

ns

Y × T × C

**

**

**

**

  1. aCTDS, NTDS, NTTP and CTTP represent conventional tillage and direct seeding, no-tillage and direct seeding, no-tillage and transplanting and conventional tillage and transplanting respectively. bHHZ, JNSM, NY103 and RY015 are Huanghuazhan, Jinnongsimiao, Nei6you103 and Rongyou1015, respectively. Means within each variable sharing the same letter are not significantly different according to LSD at P = 0.05. *Significant at P < 0.05, **Significant at P < 0.01, ns, not significant at P < 0.05.
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