> Seed systems are crucial for sustainable food system outcomes: agricultural sustainability, food security and healthy diets. > Production and distribution, innovation and regulation are the key functions of seed systems, which make a difference to sustainable food systems. > Currently used methods to measure the performance of seed systems concentrate narrowly on their contribution to agricul...

in order to study the effects of cropping systems and mulch application in relay intercropped styrian pumpkin (cucurbita pepo l.) with chickpea (cicer arietinum l.), a field experiment was conducted as factorial layout based on a randomized complete block design with three replications at the agricultural research station, college of agriculture, ferdowsi university of mashhad, during growing s...

In this paper, we propose a new seed projection method for solving shifted systems with multiple right-hand sides. This seed projection method uses a seed selection strategy. Numerical experiments are presented to show the efficiency of the newly method. Keywords—shifted systems, multiple right-hand sides, seed projection.

Seed production of annual weeds persisting through cropping phases replenishes/establishes viable seed banks from which these weeds will continue to interfere with crop production. Harvest weed seed control (HWSC) systems are now viewed as an effective means of interrupting this process by targeting mature weed seed, preventing seed bank inputs. However, the efficacy of these systems is directl...

in the present experiment, the effects of nitrogen and phosphor fertilizer application in two methods of furrow and trickle irrigation on the yield and quality of sugar beet seed cultivar 7233 were studied. the experiment was conducted as a split factorial in a completely randomized block design with three replications during 2003 and 2004 in hamedan province. main plots were allocated to irrig...

In this work we consider the simultaneous solution of large linear systems of the form Ax(j) = b(j); j = 1; : : : ; K where A is sparse and non-Hermitian. Our single-seed approach uses QMR to solve the seed system j and generate biorthogonal Krylov subspaces. Approximate solutions to the non-seed systems are simulanteously generated by minimizing their appropriately projected residuals. After t...