Interactions of Straw Disposal Methods and Direct Drilling or Cultivations on Winter Wheat (Triticum aestivum) grown on a Clay Soil

Christian, D. G.; Bacon, E. T. G.; Brockie, D.; Glen, D. M.; Gutteridge, R. J.; Jenkyn, J. F.

doi:10.1006/jaer.1999.0423

Cited by 30 publications

(18 citation statements)

References 21 publications

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“…Most farmers in Tunisia practise direct drilling into cereal residues, therefore, unexpected grain yield declines due to continuous cropping may be avoided by increasing awareness of potential barley autotoxicity (Tollenaar et al. 1993, Christian et al. 1999).…”

Section: Introductionmentioning

confidence: 99%

“…Barley autotoxicity may depress grain yields under continuous cropping of barley. Most farmers in Tunisia practise direct drilling into cereal residues, therefore, unexpected grain yield declines due to continuous cropping may be avoided by increasing awareness of potential barley autotoxicity (Tollenaar et al 1993, Christian et al 1999). The present work was undertaken to determine the variability in allelopathic potential of barley varieties affected by growing season conditions.…”

Section: Introductionmentioning

confidence: 99%

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Barley Autotoxicity as Influenced by Varietal and Seasonal Variation

Oueslati¹,

Ben-Hammouda²,

Ghorbal³

et al. 2005

J Agronomy Crop Science

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Barley (Hordeum vulgare L.) is widely cultivated in the semi-arid region of Tunisia for grain production and grazing, which often occurs during the same season. We previously demonstrated autotoxic effects of barley among varieties. The present study was conducted to test the effects of barley variety and seasonal variation on the expression of autotoxicity by barley. Four barley varieties were grown in a field experiment over three growing seasons -02). In the laboratory, germination and seedling growth bioassays were used to assess autotoxicity potential of field-harvested barley. Barley autotoxicity was fully expressed based on inhibition of radicle growth detected in seedling bioassays. Stems were often the most allelopathic plant component. Allelopathic activity of the barley varieties differed across growing seasons suggesting the influence of a seasonal effect due to the extent of water deficit during the dry season and monthly rainfall variability. The results suggest that when planning to integrate barley within cropping sequences, barley producers should carefully select appropriate barley varieties to minimize autotoxicity, which can be more severe under drought conditions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Barley Autotoxicity as Influenced by Varietal and Seasonal Variation

Oueslati¹,

Ben-Hammouda²,

Ghorbal³

et al. 2005

J Agronomy Crop Science

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“…Reported effects of repeated straw incorporation on crop yields in cereal-dominated cropping systems are inconsistent (Thomsen 1995;Christian et al 1999;Jenkyn et al 2001;Silgram & Chambers 2002;Turley et al 2003). Apparently, effects of straw on the yields of subsequent crops depend on method of disposal, number of years with annual incorporation, and other management parameters such as fertilization regime, tillage system and crop protection measures.…”

Section: Introductionmentioning

confidence: 99%

Yields of wheat and soil carbon and nitrogen contents following long-term incorporation of barley straw and ryegrass catch crops

Thomsen¹,

Christensen²

2004

soil use manage

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Three successive crops of winter wheat were grown on a sandy loam to test the residual effect of long-term annual incorporation of spring barley straw at rates of 0, 4, 8 and 12 t ha 21 , and ryegrass catch crops with or without additions of pig slurry. Soil receiving 4, 8 and 12 t ha 21 of straw annually for 18 years contained 12, 21 and 30% more carbon (C), respectively, than soil with straw removal, and soil C and nitrogen (N) contents increased linearly with straw rate. The soil retained 14% of the straw C and 37% of the straw N. Ryegrass catch-cropping for 10 years also increased soil C and N concentrations, whereas the effect of pig slurry was insignificant. Grain yield in the first wheat crop showed an average dry matter (DM) increase of 0.7 t ha 21 after treatment with 8 and 12 t straw ha 21 . In the two subsequent wheat crops, grain yield increased by 0.2 -0.3 t DM ha 21 after 8 and 12 t straw ha 21 . No grain yield increases were found after 4 t straw ha 21 in any of the three years. Previous ryegrass catch crops increased yields of wheat grain, but effects in the third wheat crop were significant only where ryegrass had been combined with pig slurry. Straw incorporation increased the N offtake in the first wheat crop. In the second crop, only 8 and 12 t straw ha 21 improved wheat N offtake, while the N offtake in the third wheat crop was unaffected. Ryegrass catch crops increased N offtake in the first and second wheat crop. Again, a positive effect in the third crop was seen only when ryegrass was combined with slurry. Long-term, annual incorporation of straw and ryegrass catch crops provided a clear and relatively persistent increase in soil organic matter levels, whereas the positive effects on the yield of subsequent wheat crops were modest and transient.

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“…It feeds on green plants and fungi (Forsyth 2004). According to Barker (1999) and Glen, Wiltshire, and Milsom (1984), this species may not be pestiferous, but Christian et al (1999) cited it as a pest of wheat and highlighted it as a pest of pasture due to its effects on plant productivity.…”

Section: B Family Arionidaementioning

confidence: 99%