优化密西西比州冬季油菜的氮肥施用量

IF 1.3 Q3 AGRONOMY
Praveen Gajula, Gurbir Singh, Gurpreet Kaur, Jagmandeep Dhillon
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引用次数: 0

摘要

美国油菜籽(Brassica napus L.)产量低,而需求量大。美国大部分油菜籽研究都集中在中西部地区,对包括密西西比州在内的南部各州的研究极少甚至没有。因此,在密西西比州开展了一项研究,以评估油菜与大豆(Glycine max L.)轮作双季的可行性,并确定其最佳氮(N)需求量。油菜收割后,在相同的实验地块内种植大豆。总共有六种氮处理(0 [对照]、34、67、101、135 和 168 千克氮公顷-1)被施用在油菜籽上,并以随机完全区组设计的方式在所有地点年重复四次。与对照组相比,施用氮可提高油菜籽产量、地上生物量和氮含量。在所有地点年中,氮含量为 168 千克/公顷时,种子产量最高,达到 1726 千克/公顷。此外,氮吸收量、株高和测试重量在 135 千克氮公顷-1 时最高,分别比对照高出 76%、21% 和 44%。油分含量和籽粒重量与氮肥用量成反比,表明氮肥用量增加会稀释油分含量。总体而言,141 千克氮肥/公顷-1 是密西西比油菜籽的最佳农艺氮肥用量,无需进一步补充氮肥,即可最大限度地提高油菜籽产量。此外,接下来的大豆作物也受益于油菜籽施氮,产量更高。这项研究证明,只要施用了最佳氮肥,油菜花就有可能进行双季种植,而不会对随后的大豆产量产生不利影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Optimizing nitrogen application rates for winter canola in Mississippi

Optimizing nitrogen application rates for winter canola in Mississippi

The production of canola (Brassica napus L.) in the United States is low, whereas the demand is high. Most US canola research is centered in the Midwest, with minimal to no research in Southern states including Mississippi. Therefore, a study was conducted in Mississippi to assess the feasibility of canola as a double crop with soybean (Glycine max L.) rotation and determine its optimum nitrogen (N) requirement. After canola was harvested, soybean was planted within the same experimental plots. In total, six N treatments (0 [control], 34, 67, 101, 135, and 168 kg N ha−1) were applied to canola and replicated four times across all site-years in a randomized complete block design. The application of N increased seed yield, aboveground biomass, and N content compared to the control in canola. Across all site-years, the highest seed yield was 1726 kg ha−1 at 168 kg N ha−1. Moreover, N uptake, plant height, and test weight were highest at 135 kg N ha−1, which were 76%, 21%, and 44% greater than control, respectively. Oil content and seed weight were inversely related to N rates indicating dilution with increased N. Overall, 141 kg N ha−1 was found to be the agronomic optimum nitrogen rate, and no further supplementation was deemed necessary to maximize canola yield in Mississippi. Additionally, the following soybean crop benefitted from the N applied to canola and produced greater yields. This study establishes that canola has the potential for double cropping without adversely affecting subsequent soybean yield, provided optimum N rates are applied.

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来源期刊
Agrosystems, Geosciences & Environment
Agrosystems, Geosciences & Environment Agricultural and Biological Sciences-Agricultural and Biological Sciences (miscellaneous)
CiteScore
2.60
自引率
0.00%
发文量
80
审稿时长
24 weeks
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