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Study on effects of light quality on leaf growth for aquatic vegetable

Brasenia schreberi J. F. Gmel, a perennial floating-leaved macrophyte with high economic value as an aquatic vegetable, has been listed as first-class endangered species in China, mainly due to its habitat loss. Protected cultivation is a potential strategy to meet the demand of both plant conservation and vegetable market, whereas pre-experiments are still needed before series of parameters can be properly set for the large-scale growth of the plants indoor. Light quality is one of the major factors controlling the development of plants and consequently becomes an important factor when planting B. schreberi indoor.

This experiment used three artificial light sources to investigate the response of B. schreberi seedlings to different light qualities, including the red-blue LED light (red: blue = 5:1, RB-LED), the white LED light (W-LED) and the white fluorescent (W-Fluo). Our results indicated that the responses of B. schreberi towards varied light qualities differed from those of most terrestrial plants. The total leaf number of the RB-LED treatment was the highest; the number of the submerged leaf and the rolled leaf of the RB-LED treatment was higher than that of the other two treatments, but the number of floating leaves was the lowest.

Both the specific leaf weight and the pigment contents per unit leaf area were the lowest in the RB-LED treatment. Quantum yield of PSⅡ (ΦPSⅡ), electron transport rate (ETR) and photochemical quenching (qP) measured through light induction curves followed the sequence from high to low as W-Fluo > W-LED > RB-LED, whereas the trend of non-photochemical quenching (NPQ) reversed. The maximum potential ETR (Ps) and maximum ETR (ETRm) derived from ETR curves further verified the trends.

Read the complete research at www.researchgate.net.

Jiafeng, Li & Yi, Cuiyu & Zhang, Chenrong & Pan, Fan & Xie, Chun & Zhou, Wenzong & Zhou, Changfang. (2021). Effects of light quality on leaf growth and photosynthetic fluorescence of Brasenia schreberi seedlings. Heliyon. 7. e06082. 10.1016/j.heliyon.2021.e06082.

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Crop protection

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As a retailer, the Colruyt Group is becoming increasingly aware of food’s impact on people’s health and the planet. It is constantly working on making its products more sustainable. Then its customers can deliberately make sustainable choices.

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This ginger is grown in a greenhouse at the Provincial Vegetable Research Center. Two REO cooperative growers also cultivate it under a non-heated plastic tunnel and greenhouse, also non-heated. The ginger was planted in mid-May and is harvested in the fall.

 

The growers used a minimal amount of organic fertilizer and no pesticides during cultivation. Growing locally reduces CO2 emissions, as shorter trips are needed to get the product to end-users. This ginger goes from the field to Belgian plates. This product usually comes from Asia and South America, increasing its carbon footprint.

 

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Ginger is very trendy. Because it is so healthy, more and more people are using this root. It is also ideal for flavoring dishes, in fresh but also in syrup or powder form. Taste and user tests have already confirmed that this Belgian ginger outshines the usual product from Brazil, Peru, and China. The Colruyt Group is therefore proud to market this locally-grown, tasty, ultra-fresh product.

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Crop protection

New research greenhouse for natural crop protection developer

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Valto received the keys to a greenhouse with 17 departments on the Hoefweg in De Lier, with which director Thorben Looije is taking the next step in his growth ambition.

Valto is a Dutch family business specialising in natural crop protection products. Their best-known product, V10, protects tomato plants against the highly damaging pepino mosaic virus. The research into new, natural crop protection products has so far been done at various locations.

After the imminent modifications to the new greenhouse complex, Valto’s researchers will be able to carry out larger tests on several crops and all in one place, close to the family business’s office at Leehove.

The new research facility fits in with the growth plans of the company, which develops and supplies biocontrol agents. “We believe in the power of nature,” Thorben Looije says. “We develop natural crop protection products to make crops resilient to plant diseases. This is a perfect fit within the goals of a greener Europe, but also those of growers, who also attach importance to health, sustainability and the environment.”

Natural protection
The government uses Green Deals to encourage companies to reduce their impact on the environment. For greenhouse horticulture and agriculture, this means using more natural crop protection. Valto wants to respond to this need by conducting more research and tests and developing new biocontrol agents. The new greenhouse will make this possible in the future.

Innovation in legislation
According to Thorben, a condition for innovation is that legislation innovates too: “Our customers want a healthy harvest and good returns. They ask us to help them prevent diseases in their crops. We are happy to do that with the help of nature, but then the legislation has to be adapted. The approval procedure for natural crop protection products now takes about 8 to 10 years. Fortunately, more and more people in The Hague and Brussels are realizing that legislation must grow along with us if we want to meet the European goals.”

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Crop protection

Innovative strategies for biological control

Year after year, the number of crop protection and chemical products that can be employed to counter pathogens and harmful insects in agriculture gets smaller and smaller. Within that scenario and with the aim of achieving a more sustainable management of resources in line with the objectives of Agenda 2030, biological control using useful predators is the only solution.

It is with this purpose in mind that Agri Impo Tech was established in 2019 as an offshoot of Agri Impol in Battipaglia (Salerno), which boasts thirty years of experience in the preparation of pollination programs using bees and bumblebees.

“What is new in the world of biological control is the possibility of feeding mites and useful insects right after they are introduced. This way, they can develop before the attack of harmful insects. This strategy means useful insects can be launched even if their counterparts are not present yet. Nutrimite, distributed by Agri Impol Tech, has led to excellent results,” reports Antonio Rago, owner of Agri Impol and Agri Impol Tech.

For the past 30 years, Antonio Rago and his company have worked to make agriculture as sustainable as possible developing strategies with a low environmental impact. Agri Impol and Biobest have in fact signed an agreement for the sale and distribution of hives of Flying Doctor bumblebees and of all insects useful for biological control.

“Tuta Trap is a pheromone trap that attracts Tuta absoluta adult males. It can be used to monitor and mass capture parasite lepidoptera. Capturing males, in fact, noticeably reduces infestations dropping them to an acceptable level. 15/20 traps per hectare are needed in greenhouses and 15/25 per hectare in open fields. These can also be combined with color insect traps for monitoring and mass capturing.”

Another objective for the company is making producers understand the importance of pollination, which represents a crucial phase for setting and, therefore, for production.

“Nature alone is not enough to meet pollination needs, this is why we suggest introducing bees and bumblebees during blossoming. We are basically talking about buzz-pollination (especially for tomatoes) carried out by bumblebees, who are more stationary than bees and able to work at lower temperatures and in less-ideal weather (wind and rain). Bees are more suitable for late blossoming.”

“Apipol box has become available this year, i.e a hive containing two bee colonies. It was developed to favor entomophilous pollination in open-field crops and we will showcase it during Macfrut.”

“We will welcome you at Macfrut, stand 111, hall B5 to present our new company established in 2019 – Agri Impol Tech.”

Do you wish to create a pollination program perfect for you or get to know biological control options? The company will welcome you at Macfrut on September 7-9, 2021.

For further information:
Agri Impol s.r.l.
via Milano
84090 Montecorvino Pugliano (SA) -Italy
+39 0828 53744
+39 0828 507182
info@agriimpol.it
www.agriimpol.it

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