Effect of nitrogen, sulfur, and phosphorus sufficiency on nutrient content in white winter wheat
Titel:
Effect of nitrogen, sulfur, and phosphorus sufficiency on nutrient content in white winter wheat
Auteur:
Rasmussen, Paul E.
Verschenen in:
Communications in soil science and plant analysis
Paginering:
Jaargang 27 (1996) nr. 3-4 pagina's 585-596
Jaar:
1996-02
Inhoud:
Correct interpretation of nitrogen (N), sulfur (S), and phosphorus (P) deficiencies in white winter wheat grown in soil is difficult because of similarity of visual symptoms and rapidly-changing nutrient content after tillering. We collected plant samples at late tillering and harvest from white winter wheat grown under three tillage systems and six fertility regimes to evaluate yield response, nutrient concentration, and DRIS index values. Tillage included no-till annual crop, conventional-till annual crop, and conventional-till wheat after fallow. Fertility regimes were: None, Moderate N, Moderate N+S, High N+S, Moderate N+S+P, and High N+S+P. Nitrogen and P increased grain yield under all tillage systems and S in annual crop systems. Plant nutrient concentration and nutrient ratios at tillering were only moderately successful in identifying nutrient deficiency. Nitrogen and S deficiency tended to intensify between late-tillering and harvest, but P deficiency did not. Both N and S deficiency were more severe under no-till than conventional tillage and with increased frequency of cropping. DRIS indices generally ranked S and P deficiency correctly, but indices using norms developed for hard red winter wheat were less precise than those using norms for white winter wheat. DRIS indices tended to overpredict N and S deficiency and underpredict P deficiency. Prediction was better for grain yield at harvest than for dry matter (DM) production at the time of sampling. Inclusion of crop and soil history in addition to tissue information seems necessary to obtain the most efficient use of fertilizer for correcting nutrient deficiency.
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