Posts tagged Sow
Rice plant population (2017)

The rice plant population target is 200 to 300 plants/m2 in southeast Australia

  • Difficult establishment conditions can often reduce plant populations to low levels

  • Growers needed plant population limits based on economics to known when to continue with a crop or re-sowing was needed

  • This research investigated plant populations for aerial and drill sown rice and determined appropriate population limits

  • We also investigated row spacings for drill sown rice

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Factors to consider when draining rice (February 2015)

This NSW DPI Primefact sheet is and overview of the guidelines to take into consideration when considering draining rice. The fact sheets covers areas such as the variety selection and time of sowing, the water management after flowering. It covers the key factors such as field layout, crop nitrogen, time when crop maturing , sowing methods, time of draining, grain development stages soil types and who and where to contact for further information. 

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Rice responds to zinc in landformed fields (2012)

When topsoil is removed during landforming, often the subsoil is exposed and remains at the soil surface. The subsoil is frequently deficient in nitrogen and phosphorus, and sometimes zinc. Zinc is important for rice nutrition. Zinc deficiency causes
flooded rice seedlings to starve for oxygen, impacting on rice seedling vigour and survival. When sowing into cut areas with exposed subsoil, apply zinc
as a seed coat or apply zinc in a fertiliser blend when drill sowing rice. In a fertiliser blend, aim to apply zinc at a rate of 5 kg Zn/ha. The zinc fertiliser needs to be placed close to the seed. High levels of soil phosphorus or high phosphorus fertiliser applications to soils with low levels of zinc are commonly responsible for zinc deficiencies in rice, as are sites where soils have elevated bicarbonate levels.

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A strategic soil nitrogen test for flooded rice (2005)

This CRC report presents the results of the project undertaken to investigate s strategic soil nitrogen tests for flooded rice. The trial was undertaken between 1998 through until 2002. The projects aim was to develop a system to forecast the optimum N supply for pre-flood application and minimize the amount being topdressed which has been a safe, but inefficient system. The method undertaken included using wet chemistry to assist in developing a test by comparing the near infrared reflectance specatra with crop productivity and N Mineraliseation. Whilst 22 previous experiments measuring yield response to N applied at sowing were also used. The study undertook seventeen methods of mineralisation and the most reliable was found to be anaerobic incubation at 40°C for 21 days. This method predicted the optimum N requirement with a standard error of about 75 kgN/ha, which is clearly unsatisfactory for an industry where the average amount of N fertiliser applied is 145 kgN/ha. There was some evidence that sowing date and deficiencies of other nutrients were partly responsible for the variability of the N response. The project concluded that there were close relationships of the NIR spectra with crop productivity and N mineralisation but because of the small data set the relationships had little predictive value. However the close relationships found between NIRS, N mineralisation measured in the laboratory and crop performance produced encouragement for further studies. The study also concluded that there were two options proposed for more reliable application of N fertiliser at the time of sowing. The first to use the existing soil test only to identify soils with large amounts of potentially mineralisable N. Such a test could be the basis of a recommendation to apply little or no N fertiliser before sowing. Rice growers would still have the option of topdressing N fertiliser at the panicle initiation stage. The results in this project suggest that yield responses are more accurately predicted by sodicity than by the soil N test. The recommendation were to undertake further studies in this area.

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Best bed guidelines for rice on beds (2002)

The possibility of growing rice on beds presents a number of challenges compared with the conventional way of growing rice. Beds have been used in other rice-growing regions in the world to reduce water use but in southern NSW the greatest benefit appears to be the flexibility the system offers for row cropping.  Growing rice on raised beds enables the rice phase to fit easily in a row cropping system Bankless channels, terracing and perhaps 1roof-topping' appears to be the best option to provide good surface drainage for the rice and other crops in the system Bed design of up to 1.8 m width works well, enabling 6 to 7 rows on the bed top.  Total nitrogen rates should be 33% higher for beds compared with conventional rice growing.  Field selection is a major consideration in weed management strategies.  Keep water shallow ponded or in the furrows until physiological maturity.

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The rice CRC's soil nitrogen test- an update and invitation to participate. (August 2001)

This IREC Farmer Newsletter article provides an overview of the past two seasons of research into soil nitrogen tests. The CRC for Sustainable rice production is developing a soil test based on near infrared (NIR) spectroscopy to provide a guide to the optimal pre sowing nitrogen fertilizer for a whole field. A recent unexpected application of this test showed that it predicted yield variation within a single field. This capability has an immediate application in the site specific management of rice.

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New rice check results to challenge farmers (2000)

This IREC Farmers Newsletter article presents information on the RIRDC funded project DAN 162A better extension programs for improved yields. The article presents information on how Rice check has performed and states that database has management and yield records for 3248 rice paddocks. The data base indicate how farmers are obtain their high yields and results are able to be used to revise Ricecheck recommendations in future. The article concludes that it has been proposed to revise the crop establishment, Amaroo and Namaga sowing time and medium grain pre flood nitrogen check. 

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Rice Establishment survey (June 1997)

This IREC Farmers Newsletter presents information and results on a year survey undertaken in Finley region between 1993-1997. The survey was undertaken as a result of the Rice check data base and district agronomist feedback identifying poor rice establishment as one of the main factors limiting increases in yields. This article presents the results under topics of area’s affected by poor establishments, factors causing problem with establishment, links between sowing time , ducks, wind and deep water. The article concludes that over the four years poor establishment areas have been reduced. It was stated that  wind, ducks, deep water, muddy waters, ibis and slime were key factors affecting the poor areas. Over the four years the importance of wind, deep water, muddy water and surface vegetation at sowing diminished while importance of slime, ducks, Ibis, aquatic worms, blood worms, snail and aerial plane striping has increased. 

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