Spring Land Production

Crop and pasture

Let us help you optimise yield. Working with you to make pasture and crop agronomy decisions, from selection advice, agri-chemical information or fertiliser options, your local PGG Wrightson team can help.

Spring Land Production

Go in the draw to win an EM soil scan of your property

from Agri Optics New Zealand Ltd

Spend a minimum of $5,000 plus GST on fertiliser, agri-chemicals and selected seed before 31 December 2018, to be in to win one of two Electromagnetic (EM) soil scans, to the value of $9,000 each!*

EM soil maps provide a useful layer of data to identify and map field variablity of the sub-surface soil to gain a greater understanding of production results and improve accuracy of zone maps.

EM surveying works by emitting an electro-magnetic field into the soil. The strength of this magnetic field and how far it can travel through the soil profile is determined by the textural composition of the soil. This can then be linked to different soil characteristics such as stone and clay content for zoning differing management zones.

In addition to its ability to identify variations in soil texture, electrical conductivity has proven to relate closely to other soil properties that often determine a field’s productivity:

  • Cation exchange capacity (CEC) – this is a measure of a soils ability to hold or release various elements and compounds.  We are mostly concerned with the soil’s ability to hold and release plant nutrients.
  • Bulk density – this can be an indicator of soil compaction. Generally, loose, porous soils and those rich in organic matter have lower bulk density. Sandy soils have relatively high bulk density since total pore space in sands is less than that of silt or clay soils.
  • Water holding capacity/drainage – drought prone areas or areas of excess moisture typically have distinct textural differences; these can be identified using electrical conductivity. Soils in the middle range of conductivity which are both medium textured and have medium water-holding capacity may be the most productive.
  • Salinity – An excess of dissolved salts in the soil is readily detected by electrical conductivity, but not usually an issue in New Zealand.

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