All About Chemistry... 2011 and beyond

Related Stories

A new innovative way to fertilize through leaves

A new study, conducted by researchers from UPM and the UAH, suggests that foliar fertilization could be used as a tool to produce plants for high quality reforestation.

Various nitrogen sources were tested in this study in order to fertilize pine leaves and oak leaves instead of using the traditional fertilization which is based on the nitrogen absorption through the root. After assessing the efficiency of leaf nitrogen uptake of the two studied species, the researcher team from Universidad de Alcalá and Politécnica de Madrid concluded that this fertilization system can be an efficient tool to complement radical fertilization regimes in order to improve plant nurseries and to plantations in nutrient-poor soils or arid conditions.

Foliar feeding is used in agriculture to rapidly and precisely control the nutrition of plants. This technique has not been tested in the forestry area, but its application for nursery production can provide solutions to improve plant quality produced for afforestation.

Researchers have used four types of nitrogen fertilizers in this study (urea, nitrate, ammonium and glycine) in two Mediterranean species typically used in restoration: the holm oak (Quercus ilex L.) and the Aleppo pine (Pinus halepensis Mill.). By using a stable isotope of nitrogen (N), researchers assessed the absorption efficiency of various nitrogen sources for both species. They observed that the best absorbed source was urea, followed by ammonia, glycine, and finally, the nitrate. These differences among the four sources can be explained due to their physicochemical properties as polarity, hygroscopicity, and solubility of compounds.

Likewise, the holm oak absorbs via foliar better than the pine, and this is associated to different anatomical properties at leaves scale, such as stomatal density. Researchers have found within every species a close relationship between cuticle permeability and foliar absorption although this relationship can vary depending on the fertilizer used. Besides, the usage of organic sources such as glycine is something new in these types of research.

Throughout this study, researchers confirmed that the two species studied can absorb intact glycine via foliar. The foliar feeding caused an increase of the plant nitrogen content in the oak and the pine studied and all the products used.

The results confirm that foliar feeding is a suitable tool to complement the traditional methods of nursery fertilization based on the radical absorption (pointing out the urea as the most efficient fertilizer). Besides, foliar feeding could be a tool potentially useful in forest plantations and in situations in which absorption via radical is not possible. Likewise, the differences observed at the absorption rates between both species will allow researchers to predict the effects of atmospheric deposition on forest systems depending on the dominant species.

Story Source:

The above story is based on materials provided by Universidad Politécnica de Madrid. Note: Materials may be edited for content and length.

Share this story with your friends!

Social Networking

Please recommend us on Facebook, Twitter and more:

Other social media tools

Global Partners

Tell us what you think of Chemistry 2011 -- we welcome both positive and negative comments. Have any problems using the site? Questions?

About us

Chemistry2011 is an informational resource for students, educators and the self-taught in the field of chemistry. We offer resources such as course materials, chemistry department listings, activities, events, projects and more along with current news releases.

Events & Activities

Are you interested in listing an event or sharing an activity or idea? Perhaps you are coordinating an event and are in need of additional resources? Within our site you will find a variety of activities and projects your peers have previously submitted or which have been freely shared through creative commons licenses. Here are some highlights: Featured Idea 1, Featured Idea 2.

About you

Ready to get involved? The first step is to sign up by following the link: Join Here. Also don’t forget to fill out your profile including any professional designations.

Global Partners