不同施氮量对裸燕麦产量品质及叶面硒肥效率的影响

为研究N肥对于裸燕麦产量和品质及硒吸收的影响，从而为冀北坝上裸燕麦高产优质富硒栽培技术提供一定的理论指导。以裸燕麦品种‘坝莜1号’为试验材料，分别在三叶期和拔节期施6个不同量的尿素，并且所有处理在三叶期和拔节期2 个时期、抽穗期和成熟前10 天2 个时期分别喷施相同量的2个型号硒肥。成熟期田间取样，室内测定裸燕麦的经济性状、产量构成、子实产量和生物产量。采用半微量凯氏定氮法测定籽粒粗蛋白含量；采用索氏提取法测定籽粒粗脂肪含量；利用酸水解法测定籽粒粗淀粉含量；利用原子荧光光度计测定籽粒硒含量。随着施N量的增加，裸燕麦的生育期有逐渐延长的趋势，裸燕麦的小穗数、穗粒重、穗数、穗粒数、籽实产量和生物产量以及籽实粗蛋白含量都有先增加后降低的趋势。施N肥增加了裸燕麦对硒肥的吸收，两年均是在三叶期施尿素210 kg/hm2拔节期施尿素240 kg/hm2时籽粒硒含量最高；N肥对于裸燕麦的穗长、粗淀粉、粗脂肪含量没有显著影响(P＞0.05)；两年对于裸燕麦的株高和千粒重影响不同，2013 年不同处理对于裸燕麦的株高和千粒重影响都不显著，而2014年有增加的作用。

Effect of Different Nitrogen Fertilizer Rates on Yield, Quality and Se Foliar Fertilizer Efficiency of Naked Oat (Avena nuda)

The paper aims to study the effects of N fertilizer on the yield, quality and Se absorption of naked oat, and provide theoretical guidance for naked oat (Avena nuda) cultivation technology leading to high yield, high quality and Se-rich in Bashang area of north Hebei Province. Naked oat variety‘Bayou No.1’was used as the material. 6 levels of urea were applied in three-leaf stage and jointing stage, respectively, and all treatments were applied with two kinds of Se foliar fertilizer in three-leaf stage, jointing stage and heading stage and 10 days before maturity. Samples were taken from experimental plots at mature stage, and the indoor measurement of the economic characters, yield components, seed yield and biomass of naked oat were carried out. Semi-Micro Kjeldahl Method was used to determine the crude protein of the grain, Soxhlet extraction method was used to determine the crude fat content of the grain, acid-hydrolysis method was used to determine the crude starch content of the grain, and atomic fluorescence photometer method was used to determine the Secontent of the grain. The results showed that with the increasing urea application amount, the growth periods also increased. And the spikelets per spike, grain weight per spike, number of spike, grains per spike, grain yield, biomass and crude protein content of naked oat increased first and then decreased. N fertilizer increased the absorption of Se fertilizer, and the highest Se contents appeared under treatment N4 (applying 210 kg/hm2 urea in three-leaf stage and 240 kg/hm2 urea in jointing stage) in both of the two years. Spike length, crude fat and starch content were not affected significantly (P＞0.05). The plant height and 1000-grain weight had different results between 2013 and 2014, the plant height and 1000- grain weight were not affected significantly (P＞0.05) by applying urea in 2013, but increased in 2014.