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硝酸钾叶面喷施对大豆(氯化钾作基肥,并逐渐增加施用量)的生长和产量的影响

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By David Dunn and Gene Stevens, University of Missouri-Delta Center, 该E-mail地址已受到防止垃圾邮件机器人的保护,您必须启用浏览器的Java Script才能看到。

Dr David Dunn – scientist at the Delta Ag Center in Qulin, Missouri, USA – held this presentation at the 34th Rice Technical Working Group Meeting in Hot Springs, Arkansas on February 29, 2012.

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By Tran Thuc Son, Le Xuan Anh, Yoav Ronen, and Harmen Tjalling Holwerda

Trials conducted in Vietnam with spring and summer rice grown on soils low in soil exchangeable K showed positive yield and net income responses from one to three foliar treatments with potassium nitrate. Grain yields and net income were improved when a portion of the basal KCl was replaced with the three foliar KNO3 sprayings.

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概要

为了验证叶面喷施硝酸钾对水稻产量及农户纯收入的影响,在越南的早稻和晚稻上共实施了4个试验,供试土壤包括粘重土及沙土。试验的喷施次数及时间为:1次,分蘖盛期喷施;2次,分蘖盛期及幼穗分化期各喷施一次;3次,分蘖期,幼穗分化期及开花末期(齐穗期)各喷施一次,以上处理硝酸钾用量均为9kg/公顷/次。

试验结果表明:与农户常规种植管理相比,常规基肥,配合3次叶面喷施硝酸钾,每次用量9 kg/ha,分别在分蘖期,幼穗分化期,齐穗期,平均最高单产提高15%(840kg/公顷),农户平均纯收入提高13%(150 US$/公顷)。

有趣的是,减少50%KCL基肥用量,在分蘖期,幼穗分化期,齐穗期,配合叶面喷施3次硝酸钾(9kg/公顷/次),仍可提高水稻产量10%,农户纯收入提高12%。

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Almonds are a highly valuable and profitable crop for Californian farmers. However, it is not easy to maintain high yielding crops that bring in premium, high quality harvests and steady pricing. One of the farmers’ major challenges is proper nutrition, especially the critical nutrient of Potassium (K). In addition, growers are faced with shortages of water, government imposed restrictions to prevent nitrogen waste, and increasing salinity levels in both water and soil. Choosing the proper K fertiliser source that maximises water and nutrient use efficiency, minimizes salinity build-up, and yet continues to enhance both yield and quality is vital. In a recent trial, the use of potassium nitrate in the fertigation clearly demonstrated to have a benefit for the grower, combined with Fan jet irrigation.

This trial in California - coordinated by UC Davis - took place over a period of 4 years, 2011-2014. The project was sponsored by PNA, aiming to find a solution for the challenges faced by almond growers, by considering the 4 R’s of fertilisation practice.

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On behalf of the Potassium Nitrate Association (PNA), Landlab research station in Quinto Vicentino (Italy), conducted a trial to test the effect on winter wheat yield of two foliar applications with potassium nitrate (KNO3) in spring.
The time and placement of foliar application of potassium nitrate caused 17% yield increase even at the highest K level in the base dressing. The foliar application of KNO3 is promoting a higher yield compared to the untreated entries and the foliar applied K is efficient for increase of yield, mainly due to more ears/m2. The yield results are clear and statistically strongly supported at a very high level of confidence.

The study is confirming the benefit of potassium nitrate applied twice as foliar spray, in the key moment of the crop cycle, at 10 kg/ha/application over all four levels of K in the base dressing nutrition.

Click here to open the complete trial report as pdf








 

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