Effect of crop residues on root growth and phosphorus acquisition of pearl millet in an acid sandy soil in Niger

Hafner, H.; George, Eckhard; Bationo, A.; Marschner, H.

doi:10.1007/bf00779182

Cited by 102 publications

(59 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There may be no difference in total P between crop residue application rates at lower fertilizer rates because plants are releasing extracellular phosphatase enzymes to mineralize P in crop residues to meet plant P demand (Reddy et al 2000). A similar demandinduced solubilization of crop residue P was reported in other Sahel research (Hafner et al 1993). Crop residues may be useful for building up total soil P levels, but fertilizer application is necessary for total N and available P supply.…”

Section: Yield Average and Trendssupporting

confidence: 76%

Long term effects of reduced fertilizer rates on millet yields and soil properties in the West-African Sahel

Adams

Gillespie

Kar

et al. 2016

Nutr Cycl Agroecosyst

View full text Add to dashboard Cite

Microdosing, the point-source application of a reduced fertilizer rate within 10 days of sowing, has increased short-term crop yields across the Sahel and is being actively scaled up as an agronomic practice. However, there is no information on the longterm effects of the technique upon soil fertility. To rectify this, this study used soil samples from the International Crop Research Institute for the SemiArid Tropics in Sadore, Niger, to assess the effects of 16 years of a reduced fertilizer rate of 15 kg N and 4.4 kg P ha -1 compared to unfertilized soil and a recommended rate of 30 kg N and 13.2 kg P ha -1 upon millet yield trend, soil chemical properties, and soil organic matter quality. The interaction of fertilizer with crop residue and manure amendments at 300, 900, and 2700 kg ha -1 was also assessed. Compared to unfertilized soil, the reduced fertilizer rate improved yield by 116 % but did not increase total N or available P. The recommended rate doubled available P and increased total N by 27 %, but resulted in slightly lower pH compared to the reduced rate. Yield trends were negative for both fertilizer treatments, indicating mineral fertilizer alone is not sustainable at Sadore. Crop residue or manure addition at 2700 kg ha -1 with fertilizer did not improve SOC but buffered pH by 0.3 units, provided nutrients beyond N and P, and changed the forms C and N functional groups in soil organic matter.

show abstract

Section: Yield Average and Trendssupporting

confidence: 76%

Long term effects of reduced fertilizer rates on millet yields and soil properties in the West-African Sahel

Adams

Gillespie

Kar

et al. 2016

Nutr Cycl Agroecosyst

View full text Add to dashboard Cite

show abstract

“…The continued extraction of water at late crop stages would be possible if the roots continued to grow during these stages, as was shown earlier, especially under different conditions such as water stress (Chopart 1983;Hafner et al 1993;Ketring and Reid 1993), thus, it might be valuable to screen for such a trait. Of course, the continued growth of the roots during the grain filling stage would be useful only if the soil profile were deep enough and had water available.…”

Section: The Need For Dynamic Measurements Of Water Extraction At Keymentioning

confidence: 96%

Water: the most important ‘molecular’ component of water stress tolerance research

Vadez

Kholová

Zaman-Allah

et al. 2013

Functional Plant Biol.

101

View full text Add to dashboard Cite

Abstract. Water deficit is the main yield-limiting factor across the Asian and African semiarid tropics and a basic consideration when developing crop cultivars for water-limited conditions is to ensure that crop water demand matches season water supply. Conventional breeding has contributed to the development of varieties that are better adapted to water stress, such as early maturing cultivars that match water supply and demand and then escape terminal water stress. However, an optimisation of this match is possible. Also, further progress in breeding varieties that cope with water stress is hampered by the typically large genotype Â environment interactions in most field studies. Therefore, a more comprehensive approach is required to revitalise the development of materials that are adapted to water stress. In the past two decades, transgenic and candidate gene approaches have been proposed for improving crop productivity under water stress, but have had limited real success. The major drawback of these approaches has been their failure to consider realistic water limitations and their link to yield when designing biotechnological experiments. Although the genes are many, the plant traits contributing to crop adaptation to water limitation are few and revolve around the critical need to match water supply and demand. We focus here on the genetic aspects of this, although we acknowledge that crop management options also have a role to play. These traits are related in part to increased, better or more conservative uses of soil water. However, the traits themselves are highly dynamic during crop development: they interact with each other and with the environment. Hence, success in breeding cultivars that are more resilient under water stress requires an understanding of plant traits affecting yield under water deficit as well as an understanding of their mutual and environmental interactions. Given that the phenotypic evaluation of germplasm/breeding material is limited by the number of locations and years of testing, crop simulation modelling then becomes a powerful tool for navigating the complexity of biological systems, for predicting the effects on yield and for determining the probability of success of specific traits or trait combinations across water stress scenarios.

show abstract

“…In Australia, Whitbread et al (2000) reported a K balance of +8 kg ha -1 when wheat straw was retained, and -102 kg ha -1 when straw was removed. Crop K uptake has been shown to increase when residues are retained (Hafner et al 1993;Mubarak et al 2003). Because K is not associated with structural components of plants (Marschner 1995), its release (mainly through leach-ing) from crop residues will depend less on microbiological decomposition of the residues than N or P release.…”

mentioning

confidence: 99%

Potassium release during decomposition of crop residues under conventional and zero tillage

Lupwayi¹,

Clayton²,

O’Donovan³

et al. 2006

Can. J. Soil. Sci.

View full text Add to dashboard Cite

. 2006. Potassium release during decomposition of crop residues under conventional and zero tillage. Can. J. Soil Sci. 86: 473-481. Nutrient cycling is an important part of integrated nutrient management. The litterbag method was used in field experiments to determine potassium (K) release patterns from red clover (Trifolium pratense) green manure (GM), field pea (Pisum sativum), canola (Brassica rapa) and monoculture wheat (Triticum aestivum) residues under conventional and zero tillage from 1998 to 1999 and from 1999 to 2000. Potassium contained in crop residues ranged from 25 kg ha -1 in wheat to 121 kg ha -1 in pea residues, both under zero tillage. The percentage of K released over a 52-wk period ranged from 65% of pea K under zero tillage to 99% of clover K under conventional tillage, and the amounts released were 20-32 kg ha -1 from wheat, 31-52 kg ha -1 from canola, 28-79 kg ha -1 from pea, and 31-118 kg ha -1 from legume GM residues. In both trial periods, K from wheat residues was released at a faster rate under conventional tillage than under zero tillage during the first 10 wk of residue decomposition. In contrast, K from pea and canola residues was released more quickly under zero tillage than under conventional tillage. The effect of tillage on K release from GM residues was similar to that on pea and canola residues in 1998-1999, but similar to that on wheat residues in 1999-2000. Correlations between K release and residue quality were inconsistent, presumably because K is not a structural component of plant tissue, and therefore its release is probably related more to leaching than to residue decomposition. These results show that crop residues recycle substantial amounts of K for use by subsequent crops in rotation. Lors des deux périodes d'expérimentation, les résidus de blé ont libéré plus rapidement le potassium quand le sol était travaillé que quand il ne l'était pas durant les 10 premières semaines de décomposition. Les résidus de pois et de canola, en revanche, libèrent le K plus vite quand le sol n'est pas travaillé. Le travail du sol a permis aux résidus de EV de libérer le K de la même façon que les résidus de pois et de canola en 1998-1999, mais en 1999-2000, l'effet se rapprochait davantage de celui observé avec les résidus de blé. La corrélation entre la libération du K et la qualité des résidus n'est pas cohérente, sans doute parce que le K n'entre pas dans la structure des tissus végétaux. Sa libération est donc probablement plus reliée à la lixiviation qu'à la décomposition des débris végétaux. Ces résultats révèlent que les résidus agricoles recyclent une quantité appréciable de K que les cultures subséquentes peuvent utiliser.

show abstract

Effect of crop residues on root growth and phosphorus acquisition of pearl millet in an acid sandy soil in Niger

Cited by 102 publications

References 27 publications

Long term effects of reduced fertilizer rates on millet yields and soil properties in the West-African Sahel

Long term effects of reduced fertilizer rates on millet yields and soil properties in the West-African Sahel

Water: the most important ‘molecular’ component of water stress tolerance research

Potassium release during decomposition of crop residues under conventional and zero tillage

Contact Info

Product

Resources

About