Abstract
Abstract The Diagnosis and Recommendation Integrated System (DRIS) has been successfully applied to many different annual and perennial crops. This system represents an approach to the nutrient contents of crops and is in fact an integrated set of norms. The successful applicability of DRIS to crops as a foliar diagnostic tool has demonstrated a need for the development of DRIS norm for corn in calcareous soils of Iran. Preliminary DRIS norm for corn (Zea mays L.) was developed from more than 50 sets of data on both plant and soil composition of high‐yielding population farms for the years of 1988 and 1989. Soil and leaf samples of com plants were taken at the silking stage. Soil and plant samples were analyzed by conventional methods. Letzch and Sumner's (1983) norms was taken as independent indices for DRIS data. Based on the almost average amount of nutrients in the leaf samples of high‐yielding populations, preliminary DRIS norms have been suggested as follows: N = 2.50; P = 0.25; K = 2.20; Ca = 0.50, and Mg = 0.25 percent, and Fe = 300; Mn = 80; Zn = 20; Cu = 8; and B = 20 ppm. Indices from suggested norms as well as Letzsch and Sumner's norms showed that in spite of similarity among diagnosis and order of nutrient requirement, there was no significant differences between these norms except for nitrogen and zinc. Correlation coefficients between soil and plant analysis data were negligible. Due to the lower amount of organic matter and water shortage, it is difficult to increase the percentage of nitrogen in the leaf samples to above 3.00 percent. With the high P‐ and zero ‐Zn application (higher P/Zn) which is a common practice in calcareous soils, zinc deficiency symptoms will be observed and yield will he decreased accordingly.
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Claims 8
Claim · model-written summary
Preliminary DRIS leaf norms were suggested for five macronutrients in high-yielding corn populations.
- Taxon
- corn
Zea mays subsp. mayse1 - Outcome
- preliminary DRIS normse0
- Value
- N = 2.50; P = 0.25; K = 2.20; Ca = 0.50, and Mg = 0.25 percente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“preliminary DRIS norms have been suggested as follows: N = 2.50; P = 0.25; K = 2.20; Ca = 0.50, and Mg = 0.25 percent”
e1“corn (Zea mays L.)”
Claim · model-written summary
Preliminary DRIS leaf norms were suggested for five micronutrients.
- Taxon
- cornZea mays subsp. mayse1
- Outcome
- preliminary DRIS normse2
- Value
- Fe = 300; Mn = 80; Zn = 20; Cu = 8; and B = 20 ppme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fe = 300; Mn = 80; Zn = 20; Cu = 8; and B = 20 ppm”
e1“corn (Zea mays L.)”
e2“preliminary DRIS norms have been suggested as follows”
Claim · model-written summary
The suggested norms and Letzsch and Sumner norms gave similar diagnoses and nutrient requirement orders.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- similarity among diagnosis and order of nutrient requiremente0
- Comparator
- Letzsch and Sumner's normse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Indices from suggested norms as well as Letzsch and Sumner's norms showed that in spite of similarity among diagnosis and order of nutrient requirement”
t0“corn”
Claim · model-written summary
The two sets of norms did not differ significantly except for nitrogen and zinc.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- differences between these normse0
- Qualifier
- except for nitrogen and zince0
- Comparator
- these normse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no significant differences between these norms except for nitrogen and zinc”
t0“corn”
Claim · model-written summary
Soil and plant analysis measurements had negligible correlations.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- Correlation coefficients between soil and plant analysis datae0
- Direction
- negligiblee0
- Setting
- soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Correlation coefficients between soil and plant analysis data were negligible.”
t0“corn”
Claim · model-written summary
Low organic matter and water shortage made raising corn leaf nitrogen above 3.00 percent difficult.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- percentage of nitrogen in the leaf samplese0
- Value
- above 3.00 percente0
- Qualifier
- lower amount of organic matter and water shortagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Due to the lower amount of organic matter and water shortage, it is difficult to increase the percentage of nitrogen in the leaf samples to above 3.00 percent.”
t0“corn”
Claim · model-written summary
High P and zero Zn application led to zinc deficiency symptoms in corn.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- high P‐ and zero ‐Zn applicatione0
- Outcome
- zinc deficiency symptomse0
- Setting
- calcareous soilse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With the high P‐ and zero ‐Zn application (higher P/Zn) which is a common practice in calcareous soils, zinc deficiency symptoms will be observed and yield will he decreased accordingly.”
t0“corn”
Claim · model-written summary
High P and zero Zn application was predicted to decrease corn yield.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- high P‐ and zero ‐Zn applicatione0
- Outcome
- yielde0
- Direction
- decreasede0
- Setting
- calcareous soilse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With the high P‐ and zero ‐Zn application (higher P/Zn) which is a common practice in calcareous soils, zinc deficiency symptoms will be observed and yield will he decreased accordingly.”
t0“corn”
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