Abstract
Abstract This study examined the potential of cover crops (fodder rape, oats, and white lupin) to improve phosphorus (P) availability in a high P-fixing Red Ferrosol soil at Robertson, New South Wales. Of particular interest was a fourth cover crop that consisted of white lupin which has P releasing characteristics, grown in combination with fodder rape, which scavenges P with its extensive fine root system. The cover crops were grown for 17 weeks and then mulched at 30 cm above ground to simulate grazing. The cultivar of white lupin used (Kiev Mutant) made poor regrowth after mulching. At 27 weeks after sowing, the cover crops were slashed at soil level and incorporated into the soil. After 7 weeks of decomposition, each cover crop plot was split, and seed potatoes were sown with and without fertilizer. Levels of Olsen-extractable P in the fertilized subplots previously sown to lupin and the lupin/fodder rape combination were significantly higher (16 and 38%, respectively) than in the unfertilized plots at 8 weeks after sowing the potatoes. However, Olsen-extractable P levels in the fertilized oat and fodder rape subplots were similar to those in the unfertilized subplots. Fertilizer increased the yield of potato tubers, but prior cover crop had no effect on tuber yield. The mean apparent recoveries of fertilizer P and N in tubers from the fertilized plants were 4 and 52%, respectively. Although tuber yield did not reflect differences in extractable P among the fertilized subplots, the results suggest that cover crops containing white lupin have the potential to improve P availability to the following potato crop. However, the cultivar of white lupin must be capable of recovering after grazing and match the growth of a companion cover crop. The cover crops containing fodder rape significantly reduced the incidence of Rhizoctonia, presumably due to the biofumigation effect of the rape. The high biomass of the fodder rape and lupin/fodder rape cover crops provided excellent protection for the soil surface against erosion during high intensity rainstorms, as well as providing grazing for stock.
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Claims 11
Claim · model-written summary
White lupin cultivar Kiev Mutant regrew poorly after mulching.
Not reportedComparator
Verbatim
e0“The cultivar of white lupin used (Kiev Mutant) made poor regrowth after mulching.”
Claim · model-written summary
Fertilized plots previously sown to lupin had 16% higher Olsen-extractable P than unfertilized plots.
- Taxon
- potatoes
Solanum tuberosume0 - Treatment
- fertilized subplots previously sown to lupine0
- Outcome
- Olsen-extractable Pe0
- Direction
- highere0
- Value
- 16e0
- Qualifier
- at 8 weeks after sowing the potatoese0
- Comparator
- unfertilized plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Levels of Olsen-extractable P in the fertilized subplots previously sown to lupin and the lupin/fodder rape combination were significantly higher (16 and 38%, respectively) than in the unfertilized plots at 8 weeks after sowing the potatoes.”
Claim · model-written summary
Fertilized plots previously sown to lupin/fodder rape had 38% higher Olsen-extractable P than unfertilized plots.
- Taxon
- potatoesSolanum tuberosume0
- Treatment
- lupin/fodder rape combinatione0
- Outcome
- Olsen-extractable Pe0
- Direction
- highere0
- Value
- 38%e0
- Comparator
- unfertilized plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Levels of Olsen-extractable P in the fertilized subplots previously sown to lupin and the lupin/fodder rape combination were significantly higher (16 and 38%, respectively) than in the unfertilized plots at 8 weeks after sowing the potatoes.”
Claim · model-written summary
Fertilized oat and fodder rape subplots had Olsen-extractable P similar to unfertilized subplots.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- fertilized oat and fodder rape subplotse0
- Outcome
- Olsen-extractable P levelse0
- Direction
- similare0
- Comparator
- unfertilized subplotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Olsen-extractable P levels in the fertilized oat and fodder rape subplots were similar to those in the unfertilized subplots.”
t0“Potato Production”
Claim · model-written summary
Fertilizer increased potato tuber yield.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- Fertilizere0
- Outcome
- yield of potato tuberse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilizer increased the yield of potato tubers, but prior cover crop had no effect on tuber yield.”
Claim · model-written summary
Prior cover crop had no effect on potato tuber yield.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- prior cover crope0
- Outcome
- tuber yielde0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilizer increased the yield of potato tubers, but prior cover crop had no effect on tuber yield.”
Claim · model-written summary
Apparent recovery of fertilizer P in potato tubers averaged 4%.
- Taxon
- PotatoSolanum tuberosumt0
- Organ / stage
- tuberse0
- Outcome
- apparent recoveries of fertilizer Pe0
- Value
- 4e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mean apparent recoveries of fertilizer P and N in tubers from the fertilized plants were 4 and 52%, respectively.”
t0“Potato Production”
Claim · model-written summary
Apparent recovery of fertilizer N in potato tubers averaged 52%.
- Taxon
- PotatoSolanum tuberosumt0
- Organ / stage
- tuberse0
- Outcome
- apparent recoveries of fertilizer P and Ne0
- Value
- 52%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mean apparent recoveries of fertilizer P and N in tubers from the fertilized plants were 4 and 52%, respectively.”
t0“Potato Production”
Claim · model-written summary
Cover crops containing fodder rape significantly reduced Rhizoctonia incidence.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- cover crops containing fodder rapee0
- Interactor
- Rhizoctonia
.jpg?width=60)
Rhizoctoniae0pathogen - Outcome
- incidence of Rhizoctoniae0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“The cover crops containing fodder rape significantly reduced the incidence of Rhizoctonia”
t0“Potato Production”
Claim · model-written summary
High biomass of fodder rape and lupin/fodder rape protected the soil surface against erosion in intense rainstorms.
Verbatim
e0“The high biomass of the fodder rape and lupin/fodder rape cover crops provided excellent protection for the soil surface against erosion during high intensity rainstorms”
Claim · model-written summary
Cover crops containing white lupin may improve phosphorus availability to the following potato crop.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- cover crops containing white lupine0
- Outcome
- improve P availability to the following potato crope0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the results suggest that cover crops containing white lupin have the potential to improve P availability to the following potato crop.”
The same questions in other papers
cover crop · yield · Solanum tuberosum (potato)Results differ
6 papers in the same direction as this paper · 11 in the opposite direction
- positive
- positive
- positive
14 papers more in this group
See all 18 papers →cover crop · Rhizoctonia · Solanum tuberosum (potato)Positive and negative results
1 in the opposite direction
- no effect
fertilization · nutrient: content · Solanum tuberosum (potato)Positive and negative results
25 papers in the same direction as this paper · 97 in the opposite direction
- positive
- positive
- positive
119 papers more in this group
See all 123 papers →fertilization · yield · Solanum tuberosum (potato)Positive and negative results
393 papers in the same direction as this paper · 48 in the opposite direction · 8 reporting no difference from an alternative
- negative
- negative
- no effect
446 papers more in this group
See all 450 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.