The Effect of Deficit Irrigation on Dry Matter Partitioning, Mobilization and Radiation Use Efficiency of Common Bean (Phaseolus Vulgaris L.)

On-farm trial was conducted from 2005 to 2008 to test the hypothesis that reduction of total dry matter (TDM) in crops can occur after a decreased radiation use efficiency (RUE) due to shortage of nitrogen and irrigation, we applied three irrigations treatments (D1, D2 and D3) and four nitrogen rates (N1, N2, N3 and N4). Photosynthetic active radiation absorbed or cumulative light interception (PARabs) and RUE of Durum wheat were measured. Results showed that D1N1 treatment recorded the highest LAI, PARabs, TDM and RUE. The maximum LAI was obtained 140 DAS (days after sowing) under treatment D1N2 (6.42) and the lowest LAI at the same phase belonged to treatment D2N4 (3.86). At the harvest, the maximum of TDM was 1487 g m-2 recorded under treatment D1N1. The minimum value obtained was 930 g m-2 under treatment D3N4. Also, PARabs was improved under D1N1 and D1N2 treatments. With reduced N application rates and irrigation doses, PARabs was decreased and the lowest values were observed under D3N4 condition. The RUE, varied from 1.55 g MJ-1 (D1N1) to 1.24 g MJ-1 (D3N4), was affected and decreased under deficit irrigation and low nitrogen conditions. In conclusion, the results of this study seem to show that D1N1 and D1N2 treatments can be beneficial for Durum wheat under field conditions in semi arid zone of Tunisia, for the purpose of improving RUE and maximizing grain yield.

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Comparative effects of partial root drying (PRD) and regulated deficit irrigation (RDI) on water relations and water use efficiency in common bean (Phaseolus vulgaris L.)

Agriculture Ecosystems & Environment ◽

10.1016/j.agee.2004.10.019 ◽

2005 ◽

Vol 106 (2-3) ◽

pp. 275-287 ◽

Cited By ~ 64

Author(s):

R. Wakrim ◽

S. Wahbi ◽

H. Tahi ◽

B. Aganchich ◽

R. Serraj

Keyword(s):

Phaseolus Vulgaris ◽

Water Use Efficiency ◽

Common Bean ◽

Water Use ◽

Water Relations ◽

Deficit Irrigation ◽

Phaseolus Vulgaris L ◽

Regulated Deficit Irrigation ◽

Use Efficiency ◽

Partial Root Drying

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Radiation interception, radiation-use efficiency and dry matter partitioning in garlic (Allium sativum L.)

European Journal of Agronomy ◽

10.1016/s1161-0301(02)00094-1 ◽

2002 ◽

Vol 18 (1-2) ◽

pp. 33-43 ◽

Cited By ~ 16

Author(s):

R.H. Rizzalli ◽

F.J. Villalobos ◽

F. Orgaz

Keyword(s):

Dry Matter ◽

Allium Sativum ◽

Radiation Use Efficiency ◽

Dry Matter Partitioning ◽

Radiation Interception ◽

Use Efficiency ◽

Radiation Use

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Recovery dynamics of rainfed winter wheat after livestock grazing 2. Light interception, radiation-use efficiency and dry-matter partitioning

Crop and Pasture Science ◽

10.1071/cp11235 ◽

2011 ◽

Vol 62 (11) ◽

pp. 960 ◽

Cited By ~ 16

Author(s):

Matthew T. Harrison ◽

John R. Evans ◽

Hugh Dove ◽

Andrew D. Moore

Keyword(s):

Winter Wheat ◽

Dry Matter ◽

Light Interception ◽

Livestock Grazing ◽

Radiation Use Efficiency ◽

Dry Matter Accumulation ◽

Dry Matter Partitioning ◽

Grain Yields ◽

Use Efficiency ◽

Radiation Use

Grazing of cereal crops reduces canopy light interception and could potentially reduce biomass production and grain yields. Alternatively, defoliation after canopy closure may increase light penetration and enhance radiation-use efficiency (RUE, shoot dry matter produced per unit light intercepted). Changes in dry matter partitioning following grazing may also ameliorate grain yield penalties. Experiments with rainfed winter wheat were conducted near Canberra, Australia, to investigate the effect of different intensity or duration of grazing on two cultivars. Grazing reduced leaf area index (LAI), light interception and growth rates by up to 90% but did not affect overall RUE. Although grazing caused significant reductions in cumulative light interception and total dry matter accumulation, it did not affect grain yields because grazed crops had delayed phenological development, allowing increased partitioning of shoot dry matter to spikes. Grazing reduced stem dry matter accumulation and consequently decreased the amount of stem assimilate available for retranslocation to kernels by up to 75%. However, by delaying crop ontogeny, grazing prolonged green area duration after anthesis and thereby increased the supply of assimilates from current photosynthesis to developing kernels, mitigating potential yield penalties caused by defoliation.

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