Influence of Different Stake Layouts on Cassava Fresh Root Yield and Storage Root Configuration

doi:10.3969/j.issn.1000-2561.2021.10.019

Abstract

Abstract:

The effects on the cassava fresh root yield (FRY), root character, storage root configuration (SRC) were studied to obtain the optimal mechanized planting mode and harvesting agronomic-machinery parameters for cassava. A field experiment with six stake layouts, i.e. horizontal-orthodromic-symmetrical (T1), horizontal-orthodromic-interlace (T2), horizontal-slant-symmetrical (T3), horizontal-slant-interlace (T4), inclined-reverse-symmetrical (T5), inclined- reverse-interlace (T6) was conducted. Variety ‘NZ199’, which was widely cultivated across the South China and appropriate for mechanization, was used as the test material, adopted wide-narrow row (1.0 m+0.6 m) planting model on the flat field. The inclined model was helpful to increasing FRY than horizontal. The FRY of T6 and T1 was higher than that of others, up to 41.92-50.11, 38.55-48.42 t/hm², respectively. The average half width across row of T6 and T1 SRC was narrower than others, only 22.92-24.09 cm. When the harvesting half width across row per plant was 30.0 cm and the harvesting depth was 25.0 cm, the fresh storage root weight proportion and their fresh root weight of T6 and T1 were higher than that of others, up to 97.54%-98.87%, 38.12-40.87 t/hm², respectively. Comprehensive analysis, T6 and T1 were recommended within the wide-narrow row mechanized model on flat field, meanwhile, the parameter of 120.0 cm harvesting width and 25.0 cm depth were suggested for the double rows harvesting machine among narrow rows, then 98% of the FRY could be harvested.

Key words: cassava, stake layout, fesh root yield, storage root configuration, agronomic-machinery parameters

CLC Number:

S533

WEI Yunxia, LIU Lijuan, HUANG Jie, WANG Juan, LI Tian, HE Fengguang. Influence of Different Stake Layouts on Cassava Fresh Root Yield and Storage Root Configuration[J]. Chinese Journal of Tropical Crops, 2021, 42(10): 2890-2897.

Figures/Tables 7

Fig. 1 Vertical view of cassava planting plots for six stake layout treatments The A, B, C dotted boxes represent different investigation and sampling areas (Detailed sampling and survey methods shown in 1.2.2).

Fig. 2 Storage root configuration of cassava under soil

Fig. 3 Effects on cassava fresh root yield among different stake layout treatments Different lowercase letters mean significant difference among treatments (P<0.05). T1: Horizontal-orthodromic-symmetrical; T2: Horizontal-orthodromic-interlace; T3: Horizontal-slant- symmetrical; T4: Horizontal-slant-interlace; T5: Inclined-reverse- symmetrical; T6: Inclined-reverse-interlace.

Fig. 4 Effects on diameter, length and diameter/length ratio of cassava storage root among different stake layout treatments Different lowercase letters mean significant difference among treatments (P<0.05). T1: Horizontal-orthodromic-symmetrical; T2: Horizontal-orthodromic-interlace; T3: Horizontal-slant-symmetrical; T4: Horizontal-slant-interlace; T5: Inclined-reverse-symmetrical; T6: Inclined-reverse-interlace.

Fig. 5 Effects on half width along row and across row of cassava storage root among different stake layout treatments Different lowercase letters mean significant difference among treatments (P<0.05). T1: Horizontal-orthodromic-symmetrical; T2: Horizontal-orthodromic-interlace; T3: Horizontal-slant-symmetrical; T4: Horizontal-slant-interlace; T5: Inclined-reverse-symmetrical; T6: Inclined-reverse-interlace.

Fig. 6 Effects on root number proportion, fresh root yield proportion and the fresh root yield of cassava storage root among different stake layout treatments, which was local in different half width across row in 2018 Different lowercase letters mean significant difference among treatments (P<0.05). T1: Horizontal-orthodromic-symmetrical; T2: Horizontal-orthodromic-interlace; T3: Horizontal-slant-symmetrical; T4: Horizontal-slant-interlace; T5: Inclined-reverse-symmetrical; T6: Inclined-reverse-interlace.

Fig. 7 Effects on root number proportion, fresh root yield proportion and the fresh root yield of cassava storage root among different stake layout treatments under different soil depth in 2018 Different lowercase letters mean significant difference among treatments (P<0.05). T1: Horizontal-orthodromic-symmetrical; T2: Horizontal-orthodromic-interlace; T3: Horizontal-slant-symmetrical; T4: Horizontal-slant-interlace; T5: Inclined-reverse-symmetrical; T6: Inclined-reverse-interlace.

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