Germination and emergence of irrigated cotton in Pakistan in relation to sowing depth and physical properties of the seedbed

G. Nabi, Christopher Mullins, M. B. Montemayor, M. S. Akhatar

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Emergence of cotton (Gossypium hirsutum L.) sown under hot dry conditions can be suboptimal in Pakistan. A field study to assess soil physical factors that can affect germination and emergence was conducted in a silt loam Fluvisol during May and June 1997. The field was irrigated and then cultivated following local practice. There were two main treatments, irrigated and control, with two replicates. Seeds of cotton were sown at 23, 46 and 92 mm depth in each plot in a split plot design. Irrigated plots received 15 mm high intensity (300 mm h(-1)) simulated rainfall 2 days after sowing (DAS). The control plots received no irrigation after sowing. Seedling germination, emergence, growth, soil temperature and matric potential of the seedbed were recorded. Undisturbed cores, equilibrated in the laboratory at a range of water contents, were used to determine penetration resistance (PR) as a function of matric potential. Field germination at all sowing depths in both treatments was similar to laboratory values. However, a hard crust, which formed on the irrigated plots, prevented emergence. Emergence in control plots decreased with increased sowing depth and there was no emergence from 92 mm depth. Emergence occurred from 6 to 9 DAS. Four DAS, the seedbed temperature at 23 mm depth exceeded 42 degreesC (a critical temperature above which germination does not occur) but seeds had already germinated before the seedbed reached this temperature. From 4 DAS onwards there was a combination of high soil temperature (> 38 degreesC), high soil impedance to shoot growth (>1.6 MPa) and low matric potential (< -500 kPa), which is likely to have reduced emergence. Roots were either delayed or prevented from entering the base of the seedbed due to its high PR. Traffic was not controlled during seedbed preparation and the effect of tractor wheels running in the base of the seedbed was partly responsible for its high PR. Use of controlled traffic should reduce this effect. Results also show the importance of preparing and sowing the seedbed as soon as possible after irrigation in order to obtain good emergence and root growth before soil physical conditions become limiting. (C) 2001 Elsevier Science B.V. All rights reserved.

Original languageEnglish
Pages (from-to)33-44
Number of pages11
JournalSoil & Tillage Research
Volume59
DOIs
Publication statusPublished - 2001

Keywords

  • crusting
  • soil strength characteristic
  • soil physical properties
  • irrigated cotton
  • emergence
  • sowing depth
  • Pakistan
  • PENETRATION RESISTANCE
  • ROOT-GROWTH
  • SEEDLING EMERGENCE
  • AGGREGATE SIZE
  • SOIL STRENGTH
  • SHOOT GROWTH
  • MAIZE
  • ESTABLISHMENT
  • COMPACTION

Cite this

Germination and emergence of irrigated cotton in Pakistan in relation to sowing depth and physical properties of the seedbed. / Nabi, G.; Mullins, Christopher; Montemayor, M. B.; Akhatar, M. S.

In: Soil & Tillage Research, Vol. 59, 2001, p. 33-44.

Research output: Contribution to journalArticle

Nabi, G. ; Mullins, Christopher ; Montemayor, M. B. ; Akhatar, M. S. / Germination and emergence of irrigated cotton in Pakistan in relation to sowing depth and physical properties of the seedbed. In: Soil & Tillage Research. 2001 ; Vol. 59. pp. 33-44.
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abstract = "Emergence of cotton (Gossypium hirsutum L.) sown under hot dry conditions can be suboptimal in Pakistan. A field study to assess soil physical factors that can affect germination and emergence was conducted in a silt loam Fluvisol during May and June 1997. The field was irrigated and then cultivated following local practice. There were two main treatments, irrigated and control, with two replicates. Seeds of cotton were sown at 23, 46 and 92 mm depth in each plot in a split plot design. Irrigated plots received 15 mm high intensity (300 mm h(-1)) simulated rainfall 2 days after sowing (DAS). The control plots received no irrigation after sowing. Seedling germination, emergence, growth, soil temperature and matric potential of the seedbed were recorded. Undisturbed cores, equilibrated in the laboratory at a range of water contents, were used to determine penetration resistance (PR) as a function of matric potential. Field germination at all sowing depths in both treatments was similar to laboratory values. However, a hard crust, which formed on the irrigated plots, prevented emergence. Emergence in control plots decreased with increased sowing depth and there was no emergence from 92 mm depth. Emergence occurred from 6 to 9 DAS. Four DAS, the seedbed temperature at 23 mm depth exceeded 42 degreesC (a critical temperature above which germination does not occur) but seeds had already germinated before the seedbed reached this temperature. From 4 DAS onwards there was a combination of high soil temperature (> 38 degreesC), high soil impedance to shoot growth (>1.6 MPa) and low matric potential (< -500 kPa), which is likely to have reduced emergence. Roots were either delayed or prevented from entering the base of the seedbed due to its high PR. Traffic was not controlled during seedbed preparation and the effect of tractor wheels running in the base of the seedbed was partly responsible for its high PR. Use of controlled traffic should reduce this effect. Results also show the importance of preparing and sowing the seedbed as soon as possible after irrigation in order to obtain good emergence and root growth before soil physical conditions become limiting. (C) 2001 Elsevier Science B.V. All rights reserved.",
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AU - Nabi, G.

AU - Mullins, Christopher

AU - Montemayor, M. B.

AU - Akhatar, M. S.

PY - 2001

Y1 - 2001

N2 - Emergence of cotton (Gossypium hirsutum L.) sown under hot dry conditions can be suboptimal in Pakistan. A field study to assess soil physical factors that can affect germination and emergence was conducted in a silt loam Fluvisol during May and June 1997. The field was irrigated and then cultivated following local practice. There were two main treatments, irrigated and control, with two replicates. Seeds of cotton were sown at 23, 46 and 92 mm depth in each plot in a split plot design. Irrigated plots received 15 mm high intensity (300 mm h(-1)) simulated rainfall 2 days after sowing (DAS). The control plots received no irrigation after sowing. Seedling germination, emergence, growth, soil temperature and matric potential of the seedbed were recorded. Undisturbed cores, equilibrated in the laboratory at a range of water contents, were used to determine penetration resistance (PR) as a function of matric potential. Field germination at all sowing depths in both treatments was similar to laboratory values. However, a hard crust, which formed on the irrigated plots, prevented emergence. Emergence in control plots decreased with increased sowing depth and there was no emergence from 92 mm depth. Emergence occurred from 6 to 9 DAS. Four DAS, the seedbed temperature at 23 mm depth exceeded 42 degreesC (a critical temperature above which germination does not occur) but seeds had already germinated before the seedbed reached this temperature. From 4 DAS onwards there was a combination of high soil temperature (> 38 degreesC), high soil impedance to shoot growth (>1.6 MPa) and low matric potential (< -500 kPa), which is likely to have reduced emergence. Roots were either delayed or prevented from entering the base of the seedbed due to its high PR. Traffic was not controlled during seedbed preparation and the effect of tractor wheels running in the base of the seedbed was partly responsible for its high PR. Use of controlled traffic should reduce this effect. Results also show the importance of preparing and sowing the seedbed as soon as possible after irrigation in order to obtain good emergence and root growth before soil physical conditions become limiting. (C) 2001 Elsevier Science B.V. All rights reserved.

AB - Emergence of cotton (Gossypium hirsutum L.) sown under hot dry conditions can be suboptimal in Pakistan. A field study to assess soil physical factors that can affect germination and emergence was conducted in a silt loam Fluvisol during May and June 1997. The field was irrigated and then cultivated following local practice. There were two main treatments, irrigated and control, with two replicates. Seeds of cotton were sown at 23, 46 and 92 mm depth in each plot in a split plot design. Irrigated plots received 15 mm high intensity (300 mm h(-1)) simulated rainfall 2 days after sowing (DAS). The control plots received no irrigation after sowing. Seedling germination, emergence, growth, soil temperature and matric potential of the seedbed were recorded. Undisturbed cores, equilibrated in the laboratory at a range of water contents, were used to determine penetration resistance (PR) as a function of matric potential. Field germination at all sowing depths in both treatments was similar to laboratory values. However, a hard crust, which formed on the irrigated plots, prevented emergence. Emergence in control plots decreased with increased sowing depth and there was no emergence from 92 mm depth. Emergence occurred from 6 to 9 DAS. Four DAS, the seedbed temperature at 23 mm depth exceeded 42 degreesC (a critical temperature above which germination does not occur) but seeds had already germinated before the seedbed reached this temperature. From 4 DAS onwards there was a combination of high soil temperature (> 38 degreesC), high soil impedance to shoot growth (>1.6 MPa) and low matric potential (< -500 kPa), which is likely to have reduced emergence. Roots were either delayed or prevented from entering the base of the seedbed due to its high PR. Traffic was not controlled during seedbed preparation and the effect of tractor wheels running in the base of the seedbed was partly responsible for its high PR. Use of controlled traffic should reduce this effect. Results also show the importance of preparing and sowing the seedbed as soon as possible after irrigation in order to obtain good emergence and root growth before soil physical conditions become limiting. (C) 2001 Elsevier Science B.V. All rights reserved.

KW - crusting

KW - soil strength characteristic

KW - soil physical properties

KW - irrigated cotton

KW - emergence

KW - sowing depth

KW - Pakistan

KW - PENETRATION RESISTANCE

KW - ROOT-GROWTH

KW - SEEDLING EMERGENCE

KW - AGGREGATE SIZE

KW - SOIL STRENGTH

KW - SHOOT GROWTH

KW - MAIZE

KW - ESTABLISHMENT

KW - COMPACTION

U2 - 10.1016/S0167-1987(00)00182-3

DO - 10.1016/S0167-1987(00)00182-3

M3 - Article

VL - 59

SP - 33

EP - 44

JO - Soil & Tillage Research

JF - Soil & Tillage Research

SN - 0167-1987

ER -