Your search found 2 records
1 Pages, L.; Serra, V.; Draye, X.; Doussan, C.; Pierret, Alain. 2009. Estimating root elongation rates from morphological measurements of the root tip. Plant and Soil, 328(1-2):35-44. [doi: https://doi.org/10.1007/s11104-009-0079-x]
(Location: IWMI HQ Call no: e-copy only Record No: H042680)
(0.19 MB)
To measure the elongation rate of individual roots in soil remains a challenge. A novel method for estimating elongation rates of excavated roots is presented. Morphological markers are identified along the tip of excavated roots, and their distance relative to the apex is measured. These markers correspond to developmental stages which follow known temporal patterns. Hence, their distance relative to the apex reflects root elongation during the period corresponding to their development. The method was tested on maize roots grown in a range of conditions and substrates. It was found that distances from markers to apices were proportional, with some variability, to elongation rates. Remarkably, the linear relationships between these distances were neither affected by substrate, nor by growing conditions. Using several markers allows covering time periods ranging from 0.3 day to 3 days as well as cross validation of estimates. Provided further testing, under a wider range of environmental conditions, is conducted, the concepts presented in this paper may serve to define a new measurement technique.
2 Tripathi, V. K.; Rajput, T. B. S.; Patel, N.; Kumar, P. 2016. Effects on growth and yield of eggplant (Solanum melongema L.) under placement of drip laterals and using municipal wastewater. Irrigation and Drainage, 65(4):480-490. [doi: https://doi.org/10.1002/ird.1971]
Wastewater irrigation ; Wastewater treatment ; Vegetable growing ; Solanum melongena ; Crop yield ; Periurban areas ; Irrigation systems ; Drip irrigation ; Groundwater irrigation ; Subsurface irrigation ; Irrigation equipment ; Performance evaluation ; Chemicophysical properties ; Soils ; Leaf Area Index ; Root length ; Dry matter content ; Models / India / New Delhi
(Location: IWMI HQ Call no: e-copy only Record No: H047798)
(0.49 MB)
This study was conducted to utilize municipal wastewater through surface and subsurface (15 and 30 cm) drip systems. Wastewater was treated though media type, disk type and combined media and disk type filters. The field experiment was conducted for two years with wastewater and groundwater. Root length density (RLD), leaf area index (LAI), and fruit yield with dry matter was recorded. LAI was lower under subsurface drip during the initial 55 days after transplantation, but in later stages it was significantly higher in comparison to surface drip. Highest RLD of 3.6 cm cm–3 was recorded under subsurface drip at 30 cm depth. RLD and LAI were related with a correlation coefficient value of 0.69. Highest dry matter content (8.75%) was recorded under surface drip but highest fruit yield was recorded under subsurface placement of drip at 15 cm depth. Subsurface drip at 15 and 30 cm depths resulted in 12.4 and 8.5% higher yields respectively, in comparison with surface drip. Utilization of wastewater through a drip irrigation system has given 6.2% increase in eggplant fruit yield in comparison to groundwater irrigation, with savings of 47, 18 and 40% of N, P2O5 and K2O nutrients respectively. The findings of the present study elucidate the potentials and constraints of wastewater utilization through a subsurface drip system.
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