Potassium fertilization of hemp (Cannabis sativa)

Planting Density and Fertilization Evidently Influence the Fiber Yield of Hemp (Cannabis sativa L.)

“…However, the effect of phosphorus on hemp fiber yield was smaller, the increase was not significant, and the overall change curve was relatively flat, findings which were similar to those reported by Vera et al [30,31]. Meanwhile, the current study found that increasing either potassium application rate or planting density exhibited a negative effect on hemp fiber yield, results which differed from those of previous studies that showed increased hemp fiber yield in response to increased potassium, but were in line with the results of Finnan and Burke's research [32], which concluded that there was no significant correlation between hemp fiber yield and soil potassium levels. The demand for potassium by hemp may be lower than expected.…”

“…The demand for potassium by hemp may be lower than expected. Despite there being high potassium uptake by hemp under high-potassium conditions, the extra uptake of potassium had no significant effect on fiber yield increase of hemp, which was considered to be luxury uptake [32].…”

Industrial Hemp Response to Nitrogen, Phosphorus, and Potassium Fertilization

“…Potassium fertilization had no effect on biomass or seed yields (Table 4). This observation is in accordance with the literature which reported an absence of K fertilization effect on hemp biomass and seed yields (Finnan and Burke, 2013). Significant environment × cultivar × fertilization interactions were observed for plant height and plant density; however, examination of the data did not reveal any particular trend (data not shown).…”

“…Although there have been very few studies that investigated industrial hemp response to K, the overall lack of response to K we observed is in agreement with previous studies, which also reported a minimal response to K (Finnan and Burke, 2013;Iványi and Izsáki, 2009). As stated for P, it is possible that the relatively limited response to K we observed could be due in part to the high initial K levels in soils of the environments used in our study (Table 1).…”

Contribution of Polish agrotechnical studies on Cannabis sativa L. to the global industrial hemp cultivation and processing economy

“…These observations are corroborated by Baraniecki [51] and Tang et al [23], who also pointed out that increasing nitrogen dosage decreases the seed yield, and therefore, in hemp cultivated for seed, nitrogen dosage should be lower and adjusted to other factors, such as the physical and chemical properties of the soil and the pioneer crop used. Finnan and Burke [57] and Tang et al [23] report that the use of higher nitrogen doses affects hemp morphology, increasing its height and shoot diameter. Furthermore, Vera et al [55] demonstrated that nitrogen may not only restrict the protein content in hemp seeds, but also significantly affect their oil content.…”