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Crops Racing Through Growth Stages

Crop Nutrition

Most spring cereal crops continue to benefit from the recent hot weather with many racing through the growth stages in a matter of days. However the late planting in May and dry weeks since make a challenging combination. With temperatures well above average and daylight hours considerably longer than for a crop drilled in early April, such conditions increase the likelihood of crop stress through too little moisture, or not enough nutrient availability to support the potential rate of growth. As a result many fields are beginning to show variation of colour and growth, and such variation is very difficult to address in a satisfactory way. Manganese (Mn) deficiency is widespread in much of our local soil types, and particularly damaging if not treated. Continuous cereal cropping, ground recently limed and dry soils all increase the likelihood of deficiency.  Symptoms begin with small pale green speckles appearing throughout the leaf and these will progress to turn brown unless treated. Barley is particularly susceptible to Mn deficiency.

A young plant that is growing extremely rapidly is producing a huge amount of new plant tissue each day. This rapid growth is limited only by the availability of nutrients to synthesise biomass, dependant on soil fertility and the plant’s own root development to take up the nutrients. It is at this time therefore when nutrient deficiencies are most likely to appear and in doing so, suppress growth rates.

The application of a broad-spectrum trace-element mix along with key macronutrients during this time is a very useful and beneficial way to supplement the plant’s nutrient requirements during periods when availability does not meet demand, most likely to coincide with phases of rapid growth. Application of a balanced and readily available source of macro & micronutrients that is topping up what is being made available from the soil at this key time will minimise the adverse effects of restricting nutrient availability.  Applying Cereal Plus High N will help your crop overcome these deficiencies.  Cereal Plus High N supplies 250gm Nitrogen, 125gm Sulphur, 93gm Manganese, 38gmMagnesium, 45gm Copper and 15gm Zinc per hectare.Winter cereals are struggling for moisture at present especially winter barley. Disease pressure has been lower than that seen for a long time and fungicides are now complete on winter barley. As temperatures are now a bit lower hopefully this will cause less stress on the flag leaf asT2 applications should now be done on winter wheat crops.

 

 

Spring Barley

Dry conditions have held back disease and at present all crops are fairly clean, but in our typically moist climate the likelihood of Rhyncho and Net blotch infections breaking out are inevitable unless controlled in good time.

Even where crops are considered to be clean, controlling Rhyncho early is much more effective than leaving it until it is seen. Once this disease comes into the crop, any eradicant treatment has limited efficacy, will stress the crop and increase the risk of Ramularia infection.

 

Spring Wheat

The young spring wheat plant isn’t subjected to the same disease burden as the overwintered winter wheat plant, therefore a two-spray programme usually suffices, with the T1 applied at 1st-2nd node, GS31-32, and the T2 applied at some point during booting, GS41-49. Whilst a large proportion of these crops are harvested as whole-crop earlier than the conventional combined crop, the feed quality of the harvested crop is very dependant on maximising grain-fill, therefore product choices and rates are similar to those of the winter crop, with significant yield responses to a proper programme.

Lodging Control

Application of Selon at early tillering will have increased tiller and ear numbers and therefore yield potential, but will not have given any reliable strengthening of the straw. Stems that extend rapidly during the stem elongation phase (as has happened this season because of late planting and high temperatures) are more likely to be weaker and so there is a greater risk of lodging especially where the crop is being pushed on with nitrogen. Sonis/Moddus can be used but its cut-off in spring barley is 2nd node, GS32. Canopy is a very useful alternative, safe to the crop and able to be used right up to and including full flag leaf, GS39.

Selon applied at mid to end of tillering (GS23-30) on spring wheat gives reliable later season lodging control, therefore it is less likely that spring wheat will need a growth regulator towards flag leaf unless the crop is particularly dense.

 

Time For Weed Control In Spring Cereals

The extended period of dry weather has allowed farmers to make significant progress on field work. For many growers it has been the earliest end to a spring planting season in a number of years.

Weed control has been difficult to date as crops are growing well but weeds are only just germinating due to the very dry conditions. To minimise the effects of competition on the crop and optimise the level of weed control, herbicide application should be carried out once all weeds have emerged but are still small, and before they begin to compete with the crop for nutrients and light. Carrying out the weed control when they are at the 2-4 leaf stage is much more effective especially on difficult weeds such as fumitory and knotgrass. Whilst chickweed resistant to a wide range of herbicides is commonplace right across the province, the  inclusion of the active arylex into the herbicide tank-mix programmes in recent years has given improved control of  chickweed and other problem weeds including fumitory and sets a new benchmark in terms of weed control in spring barley and wheat. It belongs to a chemical family classified as synthetic auxins, similar to the old hormone chemistry and controls a wide range of broad-leaved weeds including those resistant to the ALS herbicides in most winter and spring cereals, including robust control of fumitory, fat-hen and ALS resistant chickweed. Marketed as ZYPAR, it is available in co-formulation with the active ingredient florasulam and has excellent multiway compatibility along with a very wide range of other pesticides and has no major following crop restrictions. It gives excellent control of a wide range of broad-leaved weeds that includes chickweed, fumitory, fat-hen, groundsel, brassica weeds, and cleavers, but its weakest weed is redshank. Whilst it will control it alone up to 6-leaf, when tank-mixed with ALLY MAX or FOUNDATION it will control redshank right up to flowering.

Temporary nutrient issues

Manganese (Mn) deficiency is widespread in much of our local soil types, and particularly damaging to leaf vigour and yield if not treated. Continuous cereal cropping, ground recently limed and dry soils all increase the likelihood of deficiency.  Symptoms begin with small pale green speckles appearing throughout the leaf and these will progress to turn brown unless treated. Barley is particularly susceptible to Mn deficiency. MAXMAN is a highly concentrated Mn(40%) in a completely soluble chelated nitrate formulation and also supplies 10.8% Nitrogen and 11.4% Sulphur

 

A young plant that is growing extremely rapidly is producing a huge amount of new plant tissue each day. This rapid growth is limited only by the availability of nutrients to synthesise biomass, dependant on soil fertility and the plant’s own root development to take up the nutrients. It is at this time therefore when nutrient deficiencies are most likely to appear and in doing so, suppress growth rates.

The application of a broad-spectrum trace-element mix along with key macronutrients during this time is a very useful and beneficial way to supplement the plant’s nutrient requirements during periods when availability does not meet demand, most likely to coincide with phases of rapid growth ie. during tillering and as stem extension begins. Application of a balanced and readily available source of macro & micronutrients that is topping up what is being made available from the  soil at this key time will minimise the adverse effects of restricting nutrient availability. CEREAL HIGH N-supplies 250gm N, 125gm S, 38gm Mg, 93gm Mn, 45gm Cu and 15gm Zn per ha

 

 

FASTMIX MAGNESIUM PLUS is an alternative product specifically formulated to meet the increased micronutrient demand of cereals and other combinable crops with good yield potential. It is a quick acting foliar fertiliser containing high levels of magnesium and sulphur as well as manganese, zinc and boron, all in a water soluble form and readily available to the plant. It is very compatible in tank-mix with most pesticides and can be applied along with the T1 and T2 fungicide applications. Being a dry formulation, it should be fully dissolved in the tank first and other products added afterwards.

 

 

Download The New Corteva Arable App

Download the new Corteva Arable App which includes a host of information on the Corteva product range for cereals and potatoes along with the latest agronomy advice.  Click here

 

 

Drought Taking Its Toll on Spring Crops

If your spring crop is struggling for nutrients due to drought, Cereal Plus High N will give it the boost it needs to keep growing.  For more information click here…

 

Zypar – The Cornerstone of Spring Barley Weed Control

Zypar brings unrivalled control of difficult to control weeds such as fumitory, chickweed, fat hen & cleavers. Discover more …..

 

Corteva Grassland Update – May 2020


Latest grassland update from the experts at Corteva Agriscience…..

 

 

 
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