Exploring the Limits of Crop Productivity

Exploring the limits of crop productivity: beyond the limits of tipburn in lettuce.

The productivity of lettuce in a combination of high light, high temperature, and elevated CO2 has not been commonly studied because rapid growth usually causes a calcium deficiency in meristems called tipburn, which greatly reduces quality and marketability. We eliminated tipburn by blowing air directly onto the meristem, which allowed us to increase the photosynthetic photon flux (PPF) to 100...

Approaching the photosynthetic limits of crop productivity.

Exploring the limits of crop productivity. I. Photosynthetic efficiency of wheat in high irradiance environments.

The long-term vegetative and reproductive growth rates of a wheat crop (Triticum aestivum L.) were determined in three separate studies (24, 45, and 79 days) in response to a wide range of photosynthetic photon fluxes (PPF, 400-2080 micromoles per square meter per second; 22-150 moles per square meter per day; 16-20 hour photoperiod) in a near-optimum, controlled-environment. The CO2 concentra...

Exploring the limits of method

LSE has developed LSE Research Online so that users may access research output of the School. Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Users may download and/or print one copy of any article(s) in LSE Research Online to facilitate their private study or for non-commercial research. You may not engage in furthe...

Exploring the limits of prefetching

We formulate a new approach for evaluating a prefetching algorithm. We first carry out a profiling run of a program to identify all of the misses and corresponding locations in the program where prefetches for the misses can be initiated. We then systematically control the number of misses that are prefetched, the timeliness of these prefetches, and the number of unused prefetches. We validate ...