By Stuart W. Pyhrr
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70 Leaf area index FIGURE 2 Leaf area index of groundnut with various treatments, mean values over two years LEAF AREA INDEX As groundnut is an indeterminate crop, the leaf area index (LAI) values tended to increase rapidly from 40 d after sowing and continued to increase until 100 d. Genotype effects on LAI were significant. However, Figure 2 only trends in LAI that present stress influences. LAI values of control plants (T 100) were significantly higher during the 50-60-d period. e. from 80 d until harvest, than the control plants.
There was no rainfall Min 99 during the growing period (last 50 RH 89 week of January to first week of 40 Rh 90 June) in either year. Pan Rh 99 30 evaporation ranged between 5 and Epan 89 20 Epan 90 10 mm/d, the highest being during 10 Epan 90 April and May in both years. This 0 is why summer crops in Junagadh J F M A M J are fully irrigated. During vegetative Months growth (January and February), evaporative demands (ETm), and hence crop water requirements, are low. The requirements increase in the later stages of crop growth, especially during pegging and pod development, when evaporative demands also are high (April and May) (Figure 1).
S. No. 2 yields for Frontier Russet, Ranger Russet, and Shepody were insensitive to deficit irrigation, whereas total yields declined. Deficit irrigation had small effects on tuber stem-end fry colour in 1992 and 1993, and was associated with reduced tuber specific gravity only in 1994. The market value of the crop includes considerations of marketable yield, tuber size and grade, fry colour, and specific gravity. Based on the prevailing market contract, estimated profit to the grower decreased on average by 32, 41 and 68 percent with corresponding average water savings of 25, 36 and 40 percent.