Effectiveness of seed-soaked Cu, fall- versus spring-applied Cu, and Cu-coated P fertilizer on seed yield of wheat on a Cu-deficient soil

Non-Peer Reviewe

Effectiveness of foliar applications of various sulphate-S fertilizers to correct sulphur deficiency on canola in the growing season

Non-Peer Reviewe

Effectiveness of elemental S fertilizers on canola after four annual applications

Non-Peer ReviewedPlants feed on sulphate-S, but now elemental S fertilizers (which cost less per unit of S than the sulphate-S fertilizers) are available for commercial use. The effectiveness of elemental S fertilizers depends on how quickly the S is oxidized in soil for effective plant uptake. A 4-year field experiment was initiated in 1999 on S-deficient soils at two sites in northeastern Saskatchewan to determine the relative effectiveness of elemental S (ES-90 and ES-95) and sulphate-S (Agrium Plus containing both elemental S and sulphate-S, and ammonium sulphate) fertilizers on yield of canola seed. The S fertilizers were applied at 10 to 20 kg S ha-1 rates in the previous fall or in spring at sowing. At both sites, canola showed S deficiency and seed yields increased with the sulphate-S fertilizer in 1999, 2000, 2001 and 2002. In 1999, there was no significant increase in seed yield from the elemental S fertilizers, though fall application tended to give slightly greater seed yield than the spring application at one site. In 2000, 2001 and 2002, elemental S fertilizers usually corrected S deficiency on canola and increased seed yields significantly over the zero- S control, but yields were less than the sulphate-S fertilizer in most cases in 2000 and in many cases in 2001 and 2002, especially when the S fertilizers were applied in spring. Fall-applied elemental S usually had greater seed yield than the spring-applied elemental S in 2000, 2001 and 2002, and in some cases seed yields tended to be equal to sulphate-S fertilizer. Fall-applied ammonium sulphate produced (or tended to produce) lower seed yield than spring-applied ammonium sulphate in some cases. In summary, the results suggest that the elemental S fertilizers were not as effective as the sulphate-S fertilizer in increasing canola seed yields on S-deficient soils after four annual applications, particularly when the S fertilizers were applied in spring at seeding

Seedrow placement effects of different N rates on optimum and deep seeded canola using knives and shovels

Non-Peer Reviewe

Improving organic C and N in a sulphur-deficient soil with S fertilization

Non-Peer ReviewedA field experiment was conducted over nine years (1999 to 2007 growing seasons) in northeastern Saskatchewan on a S-deficient Gray Luvisol (Typic Haplocryalf) soil to determine the relative effectiveness of N alone versus combined annual application of N (120 kg N ha-1) and S (15 kg S ha-1) fertilizers to wheat-canola rotation on storage of total organic C [TOC and N (TON), and light fraction organic C (LFOC) and N (LFON)] in soil. Compared to N alone, annual applications of S fertilizer in spring in a combination with N resulted in an increase of TOC (by 2.18 Mg C ha-1), TON (by 0.138 Mg N ha-1), LFOC (by 1018 kg C ha-1) and LFON (by 42 kg N ha-1) mass in soil. The relative increases in organic C or N due to S fertilizer application were much higher for light organic fractions (36.9% for LFOC and 27.5% for LFON) than for total organic fractions (9.2% for TOC and 7.3% for TON). The findings suggest the importance of balanced/combined application of N and S fertilizers to crops in storing more organic C and N in S-deficient soil, but further research is needed on a number of S-deficient sites

Effectiveness of elemental S fertilizers on canola after three annual applications

Non-Peer ReviewedPlants feed on sulphate-S, but now elemental S fertilizers (which cost less per unit of S than the sulphate-S fertilizers) are available for commercial use. The effectiveness of elemental S fertilizers depends on how quickly the S is oxidized in soil for effective plant uptake. A 4-year field experiment was initiated in 1999 on S-deficient soils at two sites in northeastern Saskatchewan to determine the relative effectiveness of elemental S (ES-90 and ES-95) and sulphate-S (Agrium Plus containing both elemental S and sulphate-S, and ammonium sulphate) fertilizers on yield of canola seed. The S fertilizers were applied at 10 to 20 kg S ha-1 rates in the previous fall or in spring at sowing. At both sites, canola showed S deficiency and seed yields increased with the sulphate-S fertilizers in 1999, 2000 and 2001. In 1999, there was no significant increase in seed yield from the elemental S fertilizers, though fall application tended to give slightly greater yield than the spring application at one site. In 2000 and 2001, elemental S fertilizers usually corrected S deficiency on canola and increased seed yields significantly over the zero-S control, but yields were less than the sulphate-S fertilizers in most cases in 2000 and in many cases in 2001, especially when the S fertilizers were applied in spring. Fall-applied elemental S usually had greater seed yield than the spring-applied elemental S at both sites in 2000 and 2001, and in some cases seed yields tended to be equal to sulphate-S fertilizers. Fall-applied ammonium sulphate produced lower seed yield than spring-applied ammonium sulphate in some cases. In summary, the results suggest that the elemental S fertilizers were not as effective as the sulphate-S fertilizers in increasing canola seed yields on S-deficient soils after three annual applications, particularly when the S fertilizers were applied in spring at seeding time

Effectiveness of elemental S fertilizers on canola after two annual appliations

Non-Peer Reviewe

Effectiveness of elemental S fertilizers on canola after three annual applications

Non-Peer ReviewedPlants feed on sulphate-S, but now elemental S fertilizers (which cost less per unit of S than the sulphate-S fertilizers) are available for commercial use. The effectiveness of elemental S fertilizers depends on how quickly the S is oxidized in soil for effective plant uptake. A 4-year field experiment was initiated in 1999 on S-deficient soils at two sites in northeastern Saskatchewan to determine the relative effectiveness of elemental S (ES-90 and ES-95) and sulphate-S (Agrium Plus containing both elemental S and sulphate-S, and ammonium sulphate) fertilizers on yield of canola seed. The S fertilizers were applied at 10 to 20 kg S ha-1 rates in the previous fall or in spring at sowing. At both sites, canola showed S deficiency and seed yields increased with the sulphate-S fertilizers in 1999, 2000 and 2001. In 1999, there was no significant increase in seed yield from the elemental S fertilizers, though fall application tended to give slightly greater yield than the spring application at one site. In 2000 and 2001, elemental S fertilizers usually corrected S deficiency on canola and increased seed yields significantly over the zero-S control, but yields were less than the sulphate-S fertilizers in most cases in 2000 and in many cases in 2001, especially when the S fertilizers were applied in spring. Fall-applied elemental S usually had greater seed yield than the spring-applied elemental S at both sites in 2000 and 2001, and in some cases seed yields tended to be equal to sulphate-S fertilizers. Fall-applied ammonium sulphate produced lower seed yield than spring-applied ammonium sulphate in some cases. In summary, the results suggest that the elemental S fertilizers were not as effective as the sulphate-S fertilizers in increasing canola seed yields on S-deficient soils after three annual applications, particularly when the S fertilizers were applied in spring at seeding time

Effectiveness of elemental S fertilizers on wheat after two annual applications

Non-Peer Reviewe

Do canola cultivars differ in sulphur fertilizer requirements for optimum yield, seed quality and S uptake?

Non-Peer Reviewe