摘要
采用田间小区试验,研究不同供氮水平对杂交狼尾草产量、硝酸盐含量及烘干率的影响。结果表明,随着施氮水平的提高,杂交狼尾草(Pennisetum americanum × P.purpureum)的产量也明显提高,但相同的施氮水平对不同品种的影响差异不显著,单茬最高产量出现在8月份,在N3(300kg/hm2)水平时,闽牧6号杂交狼尾草(S16)的总产量(15.34kg/m2)虽然比推广品种杂交狼尾草(S1)总产量(14.84kg/m2)高,但差异不显著;硝酸盐含量,也随着氮素水平的提高而提高,试验期内,8月份的硝酸盐含量最低,闽牧6号的硝酸盐含量在相同的施氮水平下均较高,说明硝酸盐更易于在闽牧6号体内积累,但在0～300kg/hm2氮肥水平下,硝酸盐含量均处在牲畜的安全食用标准内;烘干率不受施氮水平的影响,只与生长量有关,生长量大,则烘干率高。
200, 300 A field plot trial was arranged to investigate the effects of different N application levels （0, 100, kg/hm^2） on yield, nitrate, and drying rate of 2 hybrids （S16 and S1） of Pennisetum americanumxP. purpureum. The results showed that the S16 and S1 yielded obviously higher with increased N levels but not significantly different at the same N level. The highest yield of single cropping occurred in August when the S16 and S1 treated with 300 kg/hm2 （N3） yielded respective biomasses of 15.34, 14.84 kg/m2. These 2 hybrids had higher nitrate content when applied with higher nitrogen levels, which was the lowest in August during the trial. The S16 contained higher nitrate than the S1 when applied with the same N level, indicating that nitrate was more readily accumulated by the S16. However, the nitrate content of these two hybrids fell within the safe food limits when these 2 hybrids were applied with the N at the levels ranging from 0-3 000 kg/hm2. The drying rate of the biomass was not affected by the N levels applied but related with the growth of the hybrids. The higher the growth the higher the drying rate.
出处
《热带作物学报》
CSCD
2009年第6期788-792,共5页
Chinese Journal of Tropical Crops
基金
福建省科技厅重点项目(No.2008S0009)
菌渣循环利用对农田生态环境影响与评价研究(No.2007BAD89B13)
福建省财政专项-福建省农业科学院科技创新团队建设基金资助(No.STIF-Y01)
福建省自然科学基金(No.2008J0118)
福建省科技计划重点项目(No.2006S0048)资助
关键词
杂交狼尾草
氮肥水平
产量
硝酸盐
nitrogen levels
Pennisetum americanumxP, purpureum
yield
nitrate.
