Seasonal changes in durian leaf and soil mineral nutrient element content

Field estimates of seasonal changes in mineral nitrogen contents of nitrogen fertilized sandy soils were made at Toodyay, Meckering, Tammin, Merredin and Bodallin in the Western Australian wheatbelt during 1970. A model was used to compute water balances at each site and estimates were made of mineral nitrogen ( NH4+ and NO3-) in the soils and nitrogen in the crop. Leaching, as indicated by the distribution of ammonium and nitrate with depth in the soils, was considered in relation to the net infiltration of rainfall and drainage from the 90 cm depth of soil. Leaching of nitrate was responsible for loss of mineral nitrogen from sowing to the first sampling at Toodyay. It was unlikely that nitrate was leached below 90 cm at Meckering or Tammin, and drainage at Merredin and Bodallin was negligible. There was no drainage or net infiltration of rainfall at any site after the first sampling, between June 30 and August 11. The decreases in mineral nitrogen in the soils was about equal to the plant uptake of nitrogen in all situations where there was no leaching, except at Merredin. At that site, during the period between sowing and the second sampling (August 27), there were unexplained decreases in soil mineral nitrogen. The results show that water balance studies can give reasonable understanding of the leaching and redistribution of nitrate and ammonium in sandy soils, and hence may be used to predict for different seasonal conditions.

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Effect of 2,4-D on Carbohydrate and Nutrient-Element Content and on Rapidity of Kill of Soybean Plants Growing at Different Nitrogen Levels

Botanical Gazette ◽

10.1086/335647 ◽

1950 ◽

Vol 112 (2) ◽

pp. 188-197 ◽

Cited By ~ 16

Author(s):

Dale E. Wolf ◽

Gertrude Vermillion ◽

Arthur Wallace ◽

Gilbert H. Ahlgren

Keyword(s):

Element Content ◽

Nutrient Element ◽

Nitrogen Levels ◽

Soybean Plants

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Diagnostic leaf analysis for stone fruit. 2. Seasonal changes in the leaf composition of peach

Australian Journal of Experimental Agriculture ◽

10.1071/ea9740822 ◽

1974 ◽

Vol 14 (71) ◽

pp. 822 ◽

Cited By ~ 18

Author(s):

DR Leece ◽

AR Gilmour

Keyword(s):

Seasonal Changes ◽

New South ◽

Element Composition ◽

Rate Of Change ◽

Correction Factors ◽

Nutrient Element ◽

Composition Data ◽

Leaf Analysis ◽

South Wales ◽

Leaf Composition

Changes in the nutrient-element composition of leaves of peach cvs. Golden Queen, Gaum6, and Halehaven were measured monthly during the 1971 -72 and 1972-73 seasons in New South Wales. For all cultivars, the rate of change of leaf composition was least during January and February. Thus leaf composition standards should be based on January-February samples and diagnostic sampling should be confined to this period where possible. Correction factors for adjusting the composition November, December and March samples back to January 31 levels were calculated from polynomials with time fitted to the leaf composition data.

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