苏州吴中区美甲培训

苏州美甲美睫培训学校

As knowledge grows, so too do profitable results

Serradella, an acid soil tolerant legume thriving in a tropical grass pasture. While soil tests commonly indicate trace elements are deficient in these light acid soils the main pasture response is to sulphur and phosphorus. Soil test results, when properly collected and handled, analysed by an accredited laboratory and interpreted by someone who knows what research has correlated these results with probable responses to various fertiliser types can be extremely helpful.
苏州美甲美睫培训学校

Problems occur when one or more of these aspects don’t match up. Take for example an analysis I recently saw. It was from a paddock near where I was involved in research for many years and from a soil type I have spent years working with, and had a good idea of what the nutritional paddock aspects were all about.

The interpretation of the analysis led to a recommendation that included application of zinc, boron, molybdenum, magnesium, copper sulphur and a compost product at 5.0-15 tonnes hectare.

Lime at 0.5 t/ha was also advocated. It was a native pasture paddock with naturalised legumes, sub clover and on the acidic side.

Fifty years ago such light acidic soils were treated as more or less useless in our part of the world and detailed soil studies did indicate such deficiencies, plus phosphorus and nitrogen deficiency as legumes didn’t grow well on them, even naturalised ones.The main problem however was in that era lack of understanding for the need of pastures and crops that could grow in acid soils.

While lime could correct soil acidity in the top 10cm, commonly these soils are extremely acidic right down the profile.Serradella was the initial breakthrough as it is very tolerant of acid soils and roots easily grow down a metre or more even with pH of 4.5 or so, which is common on many of these paddocks. Other acid soil tolerant legumes followed such as biserrula.

Equally important was the discovery of acid soil tolerant perennial grasses like Premier digit that proved to coexist well with winter legumes like serradella and the nitrogen they fixed to correct what were very nitrogen-deficient soils.

Also followed was better knowledge about acid soil tolerant crops such as many oat varieties, triticale, cowpeas and even today more acid-tolerant wheat and barley varieties.

With acid soil tolerant plants research found that commonly they did not need many of the elements defined in the soil tests as deficient.

But sulphur and phosphorus deficiency, almost universal in these soils unless high past superphosphate use had built them up were the critical elements. Molybdenum deficiency did also appear important, but high rates were not required and only periodic use was needed.

Once tolerant plants were found they were able to forage through acid soils for trace elements like those identified as low in soil tests. Research with acid soil tolerant species mainly noted no response to them, but sulphur and phosphorus were critical.

Trace elements such asmolybdenum, copper, zinc and boron have been found critical in several major agriculture developments in Australia, including the ninety-mile desert in SA and Vic and the Esperance region in WA. Until their appropriate use these areas were regarded as like ourlight soil areas, more or less useless.

Research has noted that soil testing for trace elements can be useful for identifying possible problems where plants are not preforming. But soil tests for trace elements are often not definitive enough unless backed by local research.

A good example is zinc deficiency commonly identified in accredited soil tests on high-pH clay soils. Research has noted adding zinc is important, especially for zinc-sensitive crops.

Next week. Pasture field day focus on pasture and fodder crops for all year feed supply.

Bob Freebairn is an agricultural consultant based at Coonabarabran. Email [email protected]苏州美甲美睫培训学校 or contact (0428) 752 149.This story Administrator ready to work first appeared on 苏州美甲美睫培训学校.

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