H.D. Chapman’s research while affiliated with University of California, Riverside and other places

... Mineral elements extracted from leaf tissues according to Chapman and Pratt (1961), Phosphorus determined according to the method described by Humphries (1956) while Potassium determined photometrically according to Williams and Twine (1961), Calcium and Magnesium determined by atomic absorption spectrophotometer according to AOAC (1984) and total nitrogen was determined by Micro-kejeldhal, Tector model 1026 after digestion in sulphuric acid (Horwiz, 2002). ...

Reference:

Effect of Moringa olifera Leaf Extract on Growth and Productivity of Three Cereal Forages

... At harvest, plant samples were separated into straw and grains, dried at 70 °C for 72 hours, weighed, digested with concentration H 2 SO 4 /HCLO 4 and analyzed for total nitrogen, phosphorus and potassium (Chapman & Pratt, 1961). Total nitrogen in plant was determined using the microkjeldahl method according to Chapman and Pratt (1961). ...

Reference:

Improving the Salinity Tolerance in Wheat Plants Using Salicylic and Ascorbic Acids

... Filtration was performed using a Whatman filter paper. Nitrogen (N), potassium (K + ) and phosphorous (P) were measured by Kjeldahl apparatus [30], on spectrophotometer [31] and flame photometer [32]. ...

Reference:

Melatonin induces proline, secondary metabolites, sugars and antioxidants activity to regulate oxidative stress and ROS scavenging in salt stressed sword lily

... At harvest, plant samples were separated into straw and grains, dried at 70 °C for 72 hours, weighed, digested with concentration H 2 SO 4 /HCLO 4 and analyzed for total nitrogen, phosphorus and potassium (Chapman & Pratt, 1961). Total nitrogen in plant was determined using the microkjeldahl method according to Chapman and Pratt (1961). ...

Reference:

Improving the Salinity Tolerance in Wheat Plants Using Salicylic and Ascorbic Acids

... Moreover, for quality analysis, seeds were subjected to oven drying at 60°C, grounded, and passed through a 1 mm sieve prior to use in the process of wet digestion to measure seed Zn and Fe contents on Atomic Absorption Spectrophotometer (33), according to the set protocol explained by Estefan et al. (34). On the other hand, dry ashing was used to quantify the seed boron contents (35) and subsequent determination was done by colorimetry using Azomethine-H (36). ...

Reference:

Effect of different concentrations of soil and foliar applied zinc, boron and iron fertilizers on seedling growth, chlorophyll content and productivity of chickpea seedlings under semi-arid environment

... Os maiores valores de P na linha da cultura são justificados, provavelmente, pela adição desse nutriente por meio da adubação. Além disso, outros fatores podem contribuir para o acúmulo de P nesta posição, tais como a baixa mobilidade do P no solo e a reduzida exportação desse nutriente pelas colheitas (Pratt et al., 1956). Resultados similares foram apresentados por Borges & Kiehl (1997). ...

Reference:

Impacto do cultivo de citros em propriedades químicas, densidade do solo e atividade microbiana de um Podzólico Vermelho-Amarelo