Abstract
SUMMARY Studies were conducted to determine possible leaching or fixation problems in growing sudangrass ( Sorghum Sudanese Stapf.) when urea, ammonium sulphate plus triple superphosphate, and ammonium polyphosphate fertilizer were applied as a seed-bed application to the very sandy soils of the Libyan Sahara near the Kufra Oasis. The effectiveness of the nitrogen source was measured by plant colour, leaf analysis, and seedling height. The urea nitrogen plus single superphosphate when applied and watered-in did not supply enough nitrogen to obtain a vigorous green seedling compared with ammonium polyphosphate (21% N, 53% P 2O6), which produced excellent vigorous green seedlings. The ammonia source supplied more nitrogen than the urea imder the conditions of these trials. The application of urea 1, 2, 4, and 8 days before sowing was inadequate in supplying nitrogen to meet the early demand of the sudangrass seedlings. Sudangrass seedlings after 26 days were only 5–6·3 cm tall. With a seed-bed application of 36–72 kg N/ha as ammonium sulphate under comparable circumstances, sudangrass seedling height was 21·7 cm. The plants receiving no nitrogen applied before sowing were 6·7 cm high, similar to those which received urea. Under these virgin sandy soil conditions, the ammonium sulphate and ammonium polyphosphate (21% N, 53% P 2 O 5 ) fertilizers applied to the seed bed were retained within the root zone in sufficient amounts to give a vigorous, non-deficient sudangrass seedling. Nitrogen from urea was deficientand presumed leached beyond reach of the seedling root when applied to the seed bed. Applied post-emergence, however, urea was a very satisfactory source of nitrogen.
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Claims 9
Claim · model-written summary
Urea nitrogen plus single superphosphate did not produce vigorous green sudangrass seedlings relative to ammonium polyphosphate.
- Treatment
- urea nitrogen plus single superphosphatee0
- Outcome
- vigorous green seedlinge0
- Direction
- did not supply enough nitrogene0
- Comparator
- ammonium polyphosphatee0
Not reportedTaxon
Verbatim
e0“The urea nitrogen plus single superphosphate when applied and watered-in did not supply enough nitrogen to obtain a vigorous green seedling compared with ammonium polyphosphate (21% N, 53% P 2O6), which produced excellent vigorous green seedlings”
t0“Effect of urea and ammonium sulphate applied before sowing on sudangrass seedlings”
Claim · model-written summary
The ammonia source supplied more nitrogen than urea.
- Treatment
- ammonia sourcee0
- Outcome
- nitrogene0
- Direction
- moree0
- Qualifier
- conditions of these trialse0
- Comparator
- ureae0
Not reportedTaxon
Verbatim
e0“The ammonia source supplied more nitrogen than the urea imder the conditions of these trials”
t0“Effect of urea and ammonium sulphate applied before sowing on sudangrass seedlings”
Claim · model-written summary
Urea applied 1, 2, 4, and 8 days before sowing did not meet early nitrogen demand of sudangrass seedlings.
- Taxon
- sudangrass
Sorghum ×drummondiie0 - Treatment
- urea 1, 2, 4, and 8 days before sowinge0
- Outcome
- nitrogen to meet the early demande0
- Direction
- inadequatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of urea 1, 2, 4, and 8 days before sowing was inadequate in supplying nitrogen to meet the early demand of the sudangrass seedlings”
Claim · model-written summary
Sudangrass seedlings receiving urea reached 5–6·3 cm after 26 days.
- Taxon
- SudangrassSorghum ×drummondiie0
- Outcome
- seedlingse0
- Value
- 5–6·3 cme0
- Qualifier
- after 26 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sudangrass seedlings after 26 days were only 5–6·3 cm tall”
Claim · model-written summary
Seed-bed ammonium sulphate produced sudangrass seedlings 21·7 cm tall.
- Taxon
- sudangrassSorghum ×drummondiie0
- Treatment
- 36–72 kg N/ha as ammonium sulphatee0
- Outcome
- seedling heighte0
- Value
- 21·7 cme0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With a seed-bed application of 36–72 kg N/ha as ammonium sulphate under comparable circumstances, sudangrass seedling height was 21·7 cm”
Claim · model-written summary
No pre-sowing nitrogen produced 6·7 cm plants, similar to urea.
- Treatment
- no nitrogen applied before sowinge0
- Outcome
- plantse0
- Direction
- similare0
- Value
- 6·7 cme0
- Comparator
- ureae0
Not reportedTaxon
Verbatim
e0“The plants receiving no nitrogen applied before sowing were 6·7 cm high, similar to those which received urea”
t0“Effect of urea and ammonium sulphate applied before sowing on sudangrass seedlings”
Claim · model-written summary
Ammonium sulphate and ammonium polyphosphate were retained in the root zone sufficiently for vigorous, non-deficient seedlings.
- Taxon
- sudangrassSorghum ×drummondiie0
- Treatment
- ammonium sulphate and ammonium polyphosphatee0
- Outcome
- vigorous, non-deficient sudangrass seedlinge0
- Setting
- root zonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the ammonium sulphate and ammonium polyphosphate (21% N, 53% P 2 O 5 ) fertilizers applied to the seed bed were retained within the root zone in sufficient amounts to give a vigorous, non-deficient sudangrass seedling”
Claim · model-written summary
Nitrogen from seed-bed urea was deficient and presumed to have leached beyond seedling roots.
- Treatment
- ureae0
- Outcome
- Nitrogen from ureae0
- Qualifier
- presumed leached beyond reach of the seedling roote0
Not reportedTaxon
Verbatim
e0“Nitrogen from urea was deficientand presumed leached beyond reach of the seedling root when applied to the seed bed”
t0“Effect of urea and ammonium sulphate applied before sowing on sudangrass seedlings”
Claim · model-written summary
Post-emergence urea was a satisfactory nitrogen source.
Not reportedTaxon
Verbatim
e0“Applied post-emergence, however, urea was a very satisfactory source of nitrogen”
t0“Effect of urea and ammonium sulphate applied before sowing on sudangrass seedlings”
The same questions in other papers
nitrogen · growth · Sorghum x drummondii (Sudan grass)Positive and negative results
9 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- positive
- positive
- positive
6 papers more in this group
See all 10 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.