Phosphorus Nutrition of Soybeans as Affected by Placement of Fertilizer Phosphorus

Abstract

Bulr-eN, C. W., Sopsr., R. J. eNo Berlsy, L. D. 1983. phosohorus nutrition of soybeans as affected by placement of fertilizer phosphorus. Can. J. Soil Sci.63 199-210. Growth chamber and field experiments were conducted on Southern Manitoba soils, low in available soil phosphorus, to investigate the effects ofvarious placement methods and levels of phosphorus fertilizer on soybean (Glycine max (L.) Merrill'Maple Presto'). It was found that soybean responded well to applied phosphorus on low-P soil in growth chamber studies. In the first growth chamber experiment, P was applied in solution to l\jVa, 50Ta,25Va, l2.5%o and, lVo of the total soil volume. Dry matter yields, total phosphorus uptake and utilization of fertilizer P increased at each level of applied P as the size of the phosphated band was decreased. The results were partly attributed to greater chemical availability of P in the smaller zones of P fertilizer reaction. In a second growth chamber experiment, soybeans responded differently to phosphorus banded in six different locations. Placement of the fertilizer 2.5 cm directly below the seed was more effective in increasing dry matter yield, total phosphorus uptake and fertilizer P utilization than placement 2.5 cm and 5 cm away at the same depth or placement 5 cm below the seed, whether the band was directly below, 2.5 crn away or 5 cm away. Soybean yield responses in the field were greatest with p banded 2.5 cm directly below the seed on tow-P soils. Placement of p 2.5 cm below the seed resulted in grain yieids that were 64Vo and 5OVa higher (at the two sites) than those obtained in control plots. Sidebanding p, 2.5 cm below and 2.5 cm away from the seed at the same level of application, improved grain yields of control plots by 40Vo and 39Va. Seed placement and broadcast applications of P were not as effective in increasing grain yields. Broadcasting P in fall or in spring at rates of up to 52.38 kg P/ha did not result in significantly higher grain yields than those obtained in control plots. Placement ofP in contact with the seed appeared to reduce seedling emergence, resulting in depressed yields when 52.38 kg p/ha were applied.

No‐Tillage Soybean Response to Banded and Broadcast and Direct and Residual Fertilizer Phosphorus and Potassium Applications

“…The results obtained from the P sites did not agree with those of Bullen et al (1983), who concluded that soybean yield increases were higher with banded fertilizer P when compared with broadcast applications. Broadcast K increased yields in only one of four site‐years in these studies.…”

“…Prummel (1957) found banded K fertilizer in cereals was 3.65 times more effective than broadcast, which he attributed to reduced K fixation. Furthermore, Bullen et al (1983) reported that soybean yield increases from P applied in a band near the seed were superior to those resulting from broadcast applications. In contrast, Lutz and Jones (1974) have shown that broadcast application of P would improve soybean yields when compared with deep placement.…”

Conservation agriculture for small holder rainfed farming: Opportunities and constraints of new mechanized seeding systems

“…Provided placement of fertilizer in furrows adjacent to the seed does not cause toxicity, fertilizer use efficiency should be increased as compared with broadcasting (Bullen et al, 1983). In soils in Bangladesh where the recommended rate of P application for lentil and chickpea for broadcast application is 20 kg P ha −1 , preliminary studies by the authors at the locations of seed rate trials (Table 2) indicated a marginal yield reduction of these crops sown by VMP with strip tillage when the P rate was halved.…”

Nutrient Management for Soybean Crops

“…According to Abuli et al [27], DAP is the best source for supplying phosphorous nutrients to soybean crops. Likewise, in an experiment performed by Bullen et al [28], it was found that banding applications of phosphorous fertilizers were more effective than broadcasting in increasing growth, seed yield, and phosphorous uptake of soybeans. Growth chamber and field experiments were carried out in Southern Manitoba in low soil available phosphorous to investigate the various placement methods and level of phosphorous in soybean.…”