Dry matter and nitrogen accumulation in indeterminate autumn-sown white lupin (Lupinus albus) cv. Lunoble
1994
Julier, B. | Huyghe, C. | Papineau, J.
The dry matter and nitrogen accumulation of autumn-sown white lupin (Lupinus albus L.) cv. Lunoble was studied in four seasons at different plant densities. Total net dry matter accumulation was more than 1500 g m-2 in most conditions, and net nitrogen accumulation reached 30 g m-2 at harvest time. The mainstem and first-order branches contributed most to final dry weight and final pod weight. The distribution of dry matter among branch orders was influenced by year and density: the production of the mainstem increased and the production of upper orders decreased at the high density. Leaf area index reached 5.5 at its maximum. Each branch order sequentially developed a LAI of 2, intercepting the major part of the incident light and shading the previous one. The duration of a LAI above 2.5 was positively correlated with the total dry matter production. Pod weight was not correlated with total dry matter. During pod filling, the leaf dry matter and nitrogen decreased, possibly indicating direct mobilization of dry matter from leaves to pods.
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