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通过肥料埋藏试验及盆栽试验方法,研究了LP30日型和LP70日型包膜尿素氮素溶出对油菜生长及产量的影响。研究表明:一级反应动力学模型可很好地描述LP30日型和LP70日型包膜尿素氮素的溶出过程,其溶出速率常数分别为0.0132和0.0067。硫酸铵处理的油菜株高、株重及产量均随氮素用量的增加呈指数型增加趋势,而LP30日型和LP70日型包膜尿素处理的油菜株高、株重及产量则均随氮素用量的增加呈直线型增加趋势。与硫酸铵处理相比,LP30日型和LP70日型包膜尿素处理,在施氮量为N 0.1 g kg-1和N 0.2 g kg-1条件下,均可使油菜株高、株重及产量显著下降(P<0.01),且以LP70日型包膜尿素下降最为明显;在施氮量为N 0.4 g kg-1条件下,LP30日型包膜尿素可使油菜株高、株重及产量显著提高(P<0.01),而LP70日型包膜尿素则使油菜株高、株重及产量提高不明显,但这两种包膜尿素均可明显提高肥料溶出氮素的利用率。
By means of fertilizer burial test and pot experiment, the effects of seed filling rate and yield rate on LP30-day and LP70-day wounds were studied. The results show that the first-order reaction kinetics model can well describe the process of Li-dipping LP30-type and LP70-type diaspore diurnal implants, with dissolution rate constants of 0.0132 and 0.0067, respectively. The plant height, plant weight and yield of ammonium sulfate treated rape increased exponentially with the increase of nitrogen application rate. However, the yield, yield and yield of plantlets grown on LP30 and LP70 were all increased with N The amount of prime increased linear increase trend. Compared with ammonium sulphate treatment, LP30 and LP70 piglets could increase the plant height, plant weight and seedling weight of rapeseed under nitrogen application rates of N 0.1 g kg-1 and N 0.2 g kg-1, (P <0.01), and the decrease of photosynthetic rate was observed on day-old LP70. Under the condition of N 0.4 g kg-1, (P <0.01). However, the LP70 daily coverage was significantly enhanced at the highest yield and the yield and yield were not significantly increased. However, both of the two kinds of coated urea significantly improved the nitrogen utilization rate of fertilizer.