Imants Soil Decontamination

Imants is specialist on soil fumigation and biofumigation.

The base for this unique machine machine is the rotary spading machine, which is equipped with goose-feet to apply the fumigant and a power driven harrow and power driven smoothroller. The injection device can be separated from the rotary spader. This way it can be used as a two way operation instead of a one way operation. The fumigant is applied at a depth of 10- 12.5 cm (half way the tillage layer) and is mixed through the tillage layer by the rotating spading blades. Then the soil surface is leveled and consolidated by the rotating harrow and "sealed" by a power driven roller.
The application rates may vary from 100 - 1200 litres per ha.
Extensive research has been carried out with metham-sodium, applied with the share injector and the rotary spading injector. The results show that the distribution of MITC in the top soil was much higher in the upper 20 cm whereas in the subsoil at 90 cm and lower it was extremely low, complying with drinking water requirements.
By using a spray boom in front of the harrow the weed pressure can be reduced. That way the spader is ideal when used to control yellow nutsedge.

There are machines available for large areas and smaller areas and even for glasshouses. The Rotary spader injection is not new. It has been used for over 25 years in various countries. Lack of marketing is the reason why there hasn’t been a major breakthrough as well as the usage of MB. The current machines are very safe, well build and easy to use.

OTHER ADVANTAGES ROTATING SPADING MACHINE

The rotating spading machine proved to be the only equipment to successfully incorporate the non-fumigant nematicides/insecticides (Mocap, Temik, Vydate) evenly through the total depth of the tillage layer. Incorporating these compounds with springtine cultivators or even with rotary cultivators resulted only in mixing them in the top 5 to 6 cm, which is in most cases insufficient to control nematodes and soil-borne insects.

  • Can be used in various soil types
  • Smaller and larger machines possible
  • Various working widths
  • Driven powerharrow
  • Driven smooth roller
  • Working depth 15-35 cm (6-12")
  • Can be used with duck feet in front of spader or with a separate front unit

APPLICATION

Rotary spading machine with injection.

The base for this fumigation machine is the rotary spading machine, which is equipped with goose-foot shares or so called shanks to apply the fumigant and a power driven harrow and power driven roller. The injection device can be separated from the rotary spader. This way it can be used as a two way operation instead of a one way operation. The fumigant is applied at a depth of 10- 12.5 cm (half way the tillage layer) and is mixed through the tillage layer by the rotating spading blades. Then the soil surface is leveled and consolidated by the rotating harrow and "sealed" by a power driven roller. The application rates may vary from 300-1200 litres per ha.

In recent years extensive research has been carried out with metham-sodium, applied with the share injector and the rotary spading injector. The results show that the distribution of MITC in the top soil was much higher in the upper 20 cm whereas in the subsoil at 90 cm and lower it was extremely low, complying with drinking water requirements (table 1).

This system is mainly used in:
Belgium, The Netherlands, 1000 Ha. Strwaberries, carrots, fruit trees etc., France (Normandy, Roussillon, Landes) 800 Ha. Carrots, Cornsalad, strawberries etc., Ireland, U.K., South Africa, Lettuce 400 Ha. (heavier soils) See Annex, Kenia, Chile, Morocco.

There are machines available for large areas and smaller areas and even for glasshouses. The Rotary spader injection is not new. It has been used for over 12 years in these countries. Lack of marketing is the reason why there hasn’t been a major breakthrough as well as the usage of MB. The current machines are very safe, well build and easy to use.
Test are being carried out in the autumn of 2003 by the University of Wageningen in comparison with steaming. Results can be expected by the end of May early June.
Below you will find test results carried out by the "Hilbrands Laboratory" in Assen, NL end 1980's.

Table 1. Contents of MITC in a sandy soil (experimental field in the surroundings of Witten) after injection of 300 l metham-sodium (510 g/l) per ha. Application date: 2nd november 1989; distribution of MITC in soil after 4.5 months and 275 mm precipitaion.

Table 1. Contents of MITC in a sandy soil (experimental field in the surroundings of Witten) after injection of 300 l metham-sodium (510 g/l) per ha. Application date: 2nd november 1989; distribution of MITC in soil after 4.5 months and 275 mm precipitaion.

depth (cm) mg MITC/kg dry soil
share injector rotary spading injector
0-20 0.30 0.49
30 0.18 0.027
40 0.17 0.0018
60 0.076 0.0022
90 0.0052 < 0.0001 *
120 0.0007 < 0.0001
150 0.0010 < 0.0001
180 0.0003 < 0.0001
* less than drinking water requirement.

As spading always brings fresh moist soil to the surface, the compaction and "sealing" of the soil is much easier than with the share injector, resulting in a higher gas concentration in the top 5 cm of the tillage layer and hence a higher nematicidal effect (table 2). Especially the increase of the nematicide in the top layer of the soil contributes to a much better nematode control.

Table 2. Percentage kill of potato cyst nematodes by 300 l metham-sodium/ha in a sandy soil (near Eesreveen). Application dates: 19th September, 1st November and 8th December.

Date Share injector
injection depth 18 cm Tillage layer
(mean)
Ground layer in cm
0-5 5-10 10-18 18-25
19/9 18 62 92 81 68
1/11 27 76 85 83 71
8/12 17 53 75 80 60
Mean 21 64 84 81 66

Date Rotary spading injector injection depth 10 cm
spading depth 23 cm Tillage layer
(mean)
Ground layer in cm
0-5 5-10 10-18 18-23
19/9 93 97 95 88 93
1/11 85 83 84 88 85
8/12 73 73 74 73 73
Mean 84 84 84 83 84

Conclusion: Trials with metham-sodium applied with the rotary spading injector have given very positive results: a) the product stays in the tillage layer and does not penetrate into the deeper subsoil (complying with drinking water requirements) and b) a better distribution into the top 10 cm of the soil results in a better nematode control (higher % kill).

Other advantages rotating spading machine

The rotating spading machine proved to be the only equipment to successfully incorporate the non-fumigant nematicides/insecticides (Mocap, Temik, Vydate) evenly through the total depth of the tillage layer. Incorporating these compounds with springtine cultivators or even with rotary cultivators resulted only in mixing them in the top 5 to 6 cm, which is in most cases insufficient to control nematodes and soil-borne insects.
Furthermore, the rotating spading machine is a very efficient main soil tillage equipment instead of ploughing and incorporates furtilisers very well.

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