Studies On Effect Of Boron, Molybdenum And Zinc On Yield, Quality And Their Forming Process Of B. Napus

The plot trial was conducted to study the effect of boron (B), molybdenum (Mo), zinc (Zn) and their interactions on yield, quality and their forming process of rapeseed rape (Brassica napus). And the pot experiment was also carried out to study the effect of different boron level on yield and quality of two rapeseed (Brassica napus) cultivars (double low cv: Huashuang 4 and double high cv: Zhongyou 821). The main results obtained were shown as follows:1 The results of plot trial showed that B application significantly increased the number of seeds per silique and siliques per plant, Mo increased the number of seeds per silique, but Zn decreased the number of seeds per silique and siliques per plant, therefore seed yield were affected to different extent. Applying B, Mo and Zn simultaneously was the most preponderant in improving seed yield in all treatments and seed yield increased up to 68.0% comparing to the control of B, Mo and Zn deficiency. The seed yield of BMo treatment was the highest among the treatments of two-fertilizer combination, which was increased by 66.8%. Significant interaction of B, Mo and Zn on seed yield was detected in both B × Mo × Zn and Mo × Zn treatments, no interaction of B × Mo and B × Zn. The results showed that B was the limiting factor in this experiment and B could screen the effect of Mo and Zn.2 During the process of seed development, seed dry weight in main inflorescence rapidly increased at the early stage, and then decreased little. But dry weight of pericarp increased and then decreased rapidly. The seed weights of 4 treatments with B treatment were higher than those of 4 treatments without B applying. Although at the early stage the pericarp weights of B treatments were higher, however, it decreased fast later. It suggested that the transportation of nutrition from pericarp to seed was improved under the condition of applying B, so seed development increased rapidly.3 B, Mo and Zn could increase oil content, decreased glucosinolate. But B application significantly decreased protein, Mo and Zn increased the content of protein. The treatments of BMo, BZn and BMoZn did not reduce protein contein, but MoZn significantly increased protein. There were some interactions between B and Mo or Zn on oil content and protein, but no interaction on glucosinolate. B application significantly enhanced oleic acid content, but depressed the content of linoleic acid, linolenic acid and erucic acid; Mo and Zn were no significant effect. Effects of combined application of B, Mo and Zn on fatty acid component were determined by their balanced action. Oil content and oleic acid of BMoZn among 8 treatments were significant more than the control, the protein, glucosinolate, linoleic acid, linolenic acid erucic acid were lower than the control.