Announcements

Job offersmore »

Tweeting Growers

Last commentsmore »

Top 5 - yesterday

  • No news has been published yesterday.

Top 5 - last week

Top 5 - last month

Exchange ratesmore »




Pelletized soy-based bioplastic fertilizers for container-crop production

Research examining biocontainers for container-crop production has demonstrated that bioplastics made from soybean [Glycine max (L.) Merr.] can supply mineral nutrients to plants.

Using soybean-based bioplastics and biochar (BC), researchers created pelletized fertilizer designed to be incorporated into soilless substrate. They evaluated the growth of ‘Honeycomb’ marigold (Tagetes patula L.), ‘Montego White’ snapdragon (Antirrhinum majus L.), and ‘Laser Synchro Scarlet’ cyclamen (Cyclamen persicum Mill.) grown with pelletized soy-based bioplastic fertilizers [soy-bioplastic polymer (SP.A) compounded with poly(lactic) acid (PLA) or polyhydroxyalkanoates (PHA), containing 15% or 25% BC] or a synthetic controlled-release fertilizer (CRF).

The objectives were to evaluate the effectiveness of prototype SP.A-based fertilizers and compare their performance to that of a traditional CRF for growing common greenhouse crops. In the first experiment, treatments of 0, 346, or 691 g nitrogen (N)/m3 of substrate from different fertilizer types were applied to marigold in containers with 15.2-cm top diameter, and in the second experiment, 0, 211, 423, 819, or 1638 g N/m3 were applied to marigold, snapdragon, and cyclamen in containers with 11.4-cm top diameter.

Marigolds grown in larger containers accumulated more shoot dry mass (SDM) when supplied with 346 or 691 g N/m3 from each type of the SP.A-based fertilizers than did plants in the nonfertilized control group. Plants supplied with synthetic CRF accumulated similar or greater SDM than plants supplied with the same rate of N from SP.A-based fertilizers.

In smaller containers, marigold and cyclamen provided with 211 or 423 g N/m3 from SP.A-based fertilizers accumulated more SDM than nonfertilized plants. Snapdragon provided with SP.A-based fertilizer grew poorly, and plants of this species died before the end of 5 weeks when provided the high and heavy rates of SP.A-based fertilizers. Plants fertilized with CRF had the largest SDM across the three species at most fertilizer concentrations.

Tissue N concentration and N uptake were greater for plants provided with SP.A-based fertilizers at most N rates (211, 423, 819 g N/m3) or synthetic CRF (all four rates) than for nonfertilized plants. The effectiveness of prototype SP.A-based fertilizers was better at common application rates (211 and 423 g N/m3), but showed a diminishing return at high and heavy rates of application (819 and 1638 g N/m3). The SP.A-based fertilizers made with PLA copolymer were more effective than those made with PHA.

The results serve as proof-of-concept that pelletized soy-based bioplastic fertilizers can be effective for meeting the nutrient needs of plants during containerized-crop production, but formulations require further development to improve their properties for use with a broad range of species and application rates.

Access the full study at HortScience.

Publication date: 11/29/2016

 


 

Other news in this sector:

4/13/2018 Mineral nutrition of phalaenopsis, with focus on nitrogen
4/10/2018 Video: Properly applying Controlled-Release Fertilizer
4/9/2018 What is sphagnum peat moss and where does it come from?
4/5/2018 Video: Grow a better plant in smaller containers
4/3/2018 Video: Why growing media contain 2 lime sources
4/3/2018 N is for Plant Health
3/23/2018 Germany: Precision fertigation with irrigation control at Blumen Colmorgen
3/21/2018 NL: "Agro Supplement is upgrade for the plant"
3/20/2018 Dümmen Orange and Ekompany test efficiency of Ekote
3/19/2018 Nutrient monitoring of Calceolaria, Cineraria, and Primula
3/14/2018 A new soil amendment to prime soil for optimal plant growth
2/22/2018 Earth Alive brings products to US market
1/30/2018 Nutritional factsheet geraniums
1/24/2018 Video: Why your controlled release fertilizer didn't work as expected
1/23/2018 Video: How long can media sit?
12/21/2017 Sphagnum peat moss influence on physical properties of growing media
12/7/2017 US (OR): Researchers model optimal amount of rainfall for plants
12/1/2017 "Bio-fertilization works in pelargonium"
11/24/2017 AkzoNobel breaks ground for European micronutrients expansion project
11/20/2017 Floriculture nutrition: The latest in phosphorus fertility

 

Leave a comment: (max. 500 characters)

  1. All comments which are not related to the article contents will be removed.
  2. All comments with non-related commercial content, will be removed.
  3. All comments with offensive language, will be removed.




  Display email address

  new code