Effects of a magnetized soil on the quality of rape (Brassica napus L.) and indication of soil-health quality Study on boron forms and their relationship in rape cultivars with different boron efficiency Effects of boron-calcium nutrition on suspension-cell of rape cultivars with different boron efficiency Effect of Nitrate Reductase (NR) Inhibitor on NR Activity in Oilseed Rape (Brassica napus L.) and Its Relation to Nitrate Content