CEREAL SEED RATES

Use of the seed rate formula below in conjunction with a target established plant population (see table below) allows greater control over the final number of plants established per square metre. Use of the formula also factors in variations in Thousand Grain Weight (TGW) as well as germination and establishment. All these factors vary greatly and make a significant difference to the final seed rate. Over-thick crops may lodge, give lower test weights and have higher disease pressure; thin crops will not have maximum yield potential and are not as competitive with weeds.

CEREAL PLANT ESTABLISHMENT

The table below provides an estimate of the expected plant establishment percentage for different drilling dates of cereals which should be included in the above calculation to determine seed rate.

WHEAT

The table shown provides the remmended established plant numbers for different drilling dates of wheat. Please note the important comment* below the table relating to when you may need to vary the target plant number. The table also gives some example seed rates at TGWs of 25,50 and 55, assuming in all cases of germination of 95% and an establishment of 90%. 

*Manawatu winter wheat growers - use 20 plants/m² less than the lowest figure above for April, May and June. 

*GRAHAM and VOLTYRON are the only cv's we recment to plant at the lowest target plant population range, all other cv's in the Cereal Seed Guide should be in the mid to high range. 

TRITICALE

Due to the Excellent tillering capacity of RISTRETTO, seed rates need to be reduced as per the table below.

RYECORN

AMILO tillers extremely well from an autumn sowing but will inherently produce fewer tiller from a winter drilling. 

BARLEY

The tabale shown provides the recmmended established plant numbers for different drilling dates of barley. It's importnant growers follow these target plant populations especially for late winter sowings.