Environmentalism

Environmental Factors and Cultural Measures Affecting The by T. Breimer

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By T. Breimer

The current research used to be performed within the interval 1977-1981 on the division of Soil technological know-how and Plant food of the rural collage Wageningen, Netherlands. This collage provided the key monetary sup­ port via a examine supply, with extra monetary aid rendered via the Dutch Nitrogen Fertilizer and Unilever learn, Netherlands. This aid is gratefully said. within the current shape this document is the author's doctoral dissertation submitted to the school of the Agricul­ tural college. the writer hereby needs to thank prof. dr. ir. A. van Diest for his criti­ cal studying and correction of the English textual content, and drjr. J. H. G. Slangen for his worthy advices in the course of the investigations and through the instruction of this record. The au thor additionally recognizes the precious aid bought from numerous Agricultural study Institutes and college go away­ ments which made amenities and manpower to be had to behavior the ex­ periments and to remodel the implications got into the current document. Contents Preface / v summary / 1 record of ab breviations / 2 advent / three 2 Literature / 6 2. 1 Nitrogen ameliorations in soil / 7 2. 2 Nitrate uptake / 7 Nitrate aid in vegetation / 7 2. three 2. four Nitrate contents in vegetation / eight 2. five Cultural measures / nine 2. five. 1 Nitrogen dressing / nine 2. five. 1. 1 Nitrogen quantity / nine 2. five . 1.

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N-dressing per ha: 150 kg N. N0 3-N:NH 4-N-ratios: 0:3, 1:2,2:1 and 3:0. Nitrapyrin: none and 45 ml N-serve 24E per kg N (= about 1%nitrapyrin). Time of application of N: all N applied immediately after sowing (D l ) on 26 April, 3 split applications (D 3) on 26 April, 10 and 24 May and 6 split applications (D6 ) as D3 and on 3,12 and 31 May. B. N-dressings per ha: 0 - 75 - 150 (as in A) - 225 kg N0 3-N, applied on 26 April. Soil sampling dates: 26 April, 2, 16, 23 and 31 May and 6 and 13 June, on fallow plots without nitrogen dressings.

1971] and tomato [Kirkby & Knight, 1977] the OH-ion excretion is relatively small. Kirkby [1974] therefore proposed a modification of the Ben Zioni-Lips model that is applicable to species having a cation: anion uptake ratio close to unity. In this model, after translocation to the shoot, nitrate-nitrogen is transformed into organic nitrogen, and carboxylates accumulate in the shoot. Translocation of carboxylates to the roots and subsequent decarboxylation in the root system are thought to be of minor importance in these species.

0 g per pot. 4 manifested the extent of NH4 -uptake and -assimilation. 5, resulting from the decomposition of cyandiamide into urea, DCD and NH 4 , ammonia-toxicity [Schenk & Wehrmann, 1979] is highly probable and accounts for the low yields. 7 The effects of N in manures on yield and chemical composition of spinach The nitrogen from the manures used in experiment 8 was only partly available for uptake by plants. 13 Band C. In these figures, one graph could be drawn for both the high and low amounts of pig-manure slurry (PMS) and one graph for the high and low amounts of farmyard manure (FYM).

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