Abstract
The response of field corn to iron and zinc fertilization was studied using a split plot experimental design in Millard County, Utah, in cooperation with the Utah State University Extension Agent and a local farmer. mainplot treatment applications consisted, on an acre basis, of (1) 5 t ons of sulfuric acid, (2) 1 ton sulfuric acid, (3) 1.8 tons gypsum, (4) check plot. Subplot treatments were (1) Fe at 5 lbs/Ac, (2) Zn at 10 lbs/Ac, (3) Fe and Zn at 5 and 10 lb / Ac, respectively, (4) check plot. The iron and zinc applications were essentially rendered unavailable by reactions of the applied iron and zinc with the highly calcareous soil matrix. Experimental variability and the relatively low rates of applied micronutrients combined to produce insignificant yield responses to micronutrient fertilization. Another study was conducted to predict the soil iron critical level. Five soils from Millard County, representing some of the soils low in iron and zinc, were selected for a greenhouse study. All five of the soils were equally divided into three groups and assigned one of three pretreatments. One- third of the soils were stressed by successive croppings with corn and oats. One-third of the soils were fertilized with Fe chelate and ZnSO4 at 5 ppm each as a pretreatment. And one-third of the soils did not receive a pretreatment. The pretreatments were designed to obtain a broader range of soil iron concentrations. After the pre treatments were completed on all of the soils, a randomized block experimental design was employed to measure potential yield increases in corn produced by the addition of Fe chelate . Two corn genotypes, an iron-efficient corn inbred (WF9) and an iron efficient corn mutant (Ysl/Ysl), were utilized in the gr eenhouse study. The treatments were (1) 5 ppm Fe chelate plus corn inbred WF9, (2) 5 ppm Fe chelate plus corn mutant Ysl/Ysl, (3) no Fe addition plus corn inbred WF9 , (4) no Fe addition plus corn mutant Ysl/Ysl. Significant yield responses to Fe fertilization were determined by an LSD statistical test . Generally, soils with a DTPA extractable iron level greater than 5 ppm did not respond to applied iron. Similar yield responses were obtained for the iron-efficient and ironinefficient varieties. A tentative critical level of DTPA extractable iron of 5 ppm was proposed for the calcareous soils of Millard County, Utah.
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Claims 6
Claim · model-written summary
Applied iron and zinc became unavailable in highly calcareous soil.
Verbatim
e0“The iron and zinc applications were essentially rendered unavailable by reactions of the applied iron and zinc with the highly calcareous soil matrix.”
e1“The response of field corn to iron and zinc fertilization was studied”
Claim · model-written summary
Micronutrient fertilization did not significantly change field yield.
Not reportedComparatorDirection
Verbatim
e0“Experimental variability and the relatively low rates of applied micronutrients combined to produce insignificant yield responses to micronutrient fertilization.”
e1“The response of field corn to iron and zinc fertilization was studied”
Claim · model-written summary
Greenhouse Fe fertilization significantly increased corn yield.
- Taxon
- corn
Zea mays subsp. mayse1 - Treatment
- Fe fertilizatione0
- Outcome
- yield responsese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant yield responses to Fe fertilization were determined by an LSD statistical test .”
e1“potential yield increases in corn produced by the addition of Fe chelate”
Claim · model-written summary
Soils above 5 ppm DTPA iron generally showed no response to added iron.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- applied irone0
- Outcome
- did not responde0
- Value
- greater than 5 ppme0
- Qualifier
- soils with a DTPA extractable iron level greater than 5 ppme0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Generally, soils with a DTPA extractable iron level greater than 5 ppm did not respond to applied iron.”
e1“potential yield increases in corn produced by the addition of Fe chelate”
Claim · model-written summary
The two corn genotypes had similar yield responses.
- Taxon
- cornZea mays subsp. mayse1
- Material
- iron-efficient and ironinefficient varietiese0
- Outcome
- yield responsese0
- Direction
- Similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Similar yield responses were obtained for the iron-efficient and ironinefficient varieties.”
e1“potential yield increases in corn produced by the addition of Fe chelate”
Claim · model-written summary
The authors proposed a tentative 5 ppm critical DTPA iron level.
- Taxon
- cornZea mays subsp. mayse1
- Outcome
- critical level of DTPA extractable irone0
- Value
- 5 ppme0
- Qualifier
- tentativee0
- Setting
- Millard County, Utahe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A tentative critical level of DTPA extractable iron of 5 ppm was proposed for the calcareous soils of Millard County, Utah.”
e1“potential yield increases in corn produced by the addition of Fe chelate”
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