Agriculture

Handbook of plant nutrition by Barker, Allen V.

By Barker, Allen V.

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A similar pattern of increase in length and number of lateral roots occurred. 1 gene occurred in the distal parts of the root system, particularly in the new and existing root hairs and in the tips of newly emerging lateral roots and in the junctions of primary and lateral roots. By 5 days of N starvation, this expression was throughout the root system (Engineer and Kranz, 2007). , 2009). No cluster roots were formed if the N supply was nonlimiting, regardless of whether it was ammonium nitrate, glycine, or protein.

Relative growth rate (RGR) is directly related to the internal concentration of nutrients such as nitrogen, so that RGR = Pn × (C − Cmin ) where Pn is the nutrient productivity (in this case nitrogen productivity, the amount of biomass produced per amount of N it contains per unit time) C is the concentration of N in the plant Cmin is the minimum N concentration below which it has no effect on plant growth (Ingestad and Ågren, 1992) As Cmin is small, Pn is in effect the slope of a linear relationship between RGR and internal N concentration at values well above Cmin.

1963; Fischer, 1993). As in other crops, a linear relationship occurs between rate of crop growth and interception of PAR (Monteith, 1977; Gallagher and Biscoe, 1978), so the increased leaf area results in a higher yield. , 1995). 2 Effects of Nitrogen Supply on Developing Seeds Grain number is dependent on the number of flower spikes formed, the number of spikelets in each spike, and the number of viable florets in each spikelet. , 1993; Ewert and Honermeier, 1999; Oscarson, 2000). However, the increase in number of grains per plant seems to come about more due to the increased number of tillers (and therefore spikes) than through there being more grains per main stem spike (Oscarson, 2000).

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