Tag Archives: humus

45–54 Irena Kristaponyte
Effect of fertilisation systems on the balance of plant nutrients and soil agrochemical properties
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Effect of fertilisation systems on the balance of plant nutrients and soil agrochemical properties

Irena Kristaponyte

Joniskelis Research Station of the Lithuanian Institute of Agriculture Joniskelis LT-39301 Pasvalys district. Lithuania; e-mail: joniskelio_lzi@post.omnitel.net
Fax: 370-71-38224

Abstract:

Clay loam soils are rich in available potassium, however, they contain a low or moderate content of phosphorus. At the Lithuanian Institute of Agriculture’s Joniskelis Research Station trials were carried out over the period of 1960–2000 on a Endocalcari-Endohypogleyic Cambisol (Cmg-n-w-can) – a clay loam soil in a five-course crop rotation, in which we investigated mineral, organic and organic-mineral fertilisation systems. Results of the sixth rotation showed that the annual application of mineral N56P48K60 fertilisers resulted in an increase of the content of available phosphorus in 5 mg kg-1 of the soil, and the reduction of potassium content in 3 mg kg-1 of the soil, compared with the initial level. In the organic fertilisation system, the application of only 80 t ha‑1 of farmyard resulted, compared with the mineral fertilisation system, in a humus content increase in the plough layer by 0.12 percentage units and that in the phosphorus content by 26.0 mg kg-1 and potassium content by 31.0 mg kg‑1. In this system the crop productivity, compared with unfertilised crops, increased by 34.1%, however, compared with the mineral fertilisation system, it declined by 14.1%. In the organic-mineral fertilisation system, the application of 40, 60 and 80 t ha‑1 of farmyard manure and NPK fertilisers in the same amount as in the mineral fertilisation system resulted in the following increases – soil humus content by 0.18; 0.24 and 0.21 percentage units, phosphorus content by 41.0, 61.0 and 61.0 mg kg-1, potassium content by 36.0; 46.0 and 54.0 mg kg-1, and crop rotation productivity by 6.2, 7.6 and 7.8, respectively, compared with the mineral fertilisation system.

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87–97 S. Maiksteniene and A. Arlauskiene
Effect of preceding crops and green manure on the fertility of clay loam soil
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Effect of preceding crops and green manure on the fertility of clay loam soil

S. Maiksteniene and A. Arlauskiene

Joniskelis Research Station of the Lithuanian Institute of Agriculture, Joniskelis, LT-5240 Pasvalys District, Lithuania; tel.fax.: 370-71-38224; e-mail: joniskelio_lzi@post.omnitel.net

Abstract:

Influence of red clover (Trifolium pratense L.), sown lucerne (Medicago sativa L.), vetch and oat mixture (Vicia sativa L., Avena sativa L.) and green material of these legume crops used as green manure on the build up of biological N variation of soil properties and productivity of winter wheat (Triticum aestivum L.) was investigated on Endocalcari-Endohypogleyic Cambisol (CMg-n-w-can), according to the texture – clay loam on silty clay. Experiments were carried out at the Joniskelis Research Station of the Lithuanian Institute of Agriculture over the period 1996–2000. It was revealed that lucerne and clover left the highest content of plant residues in the soil (13.7 t ha-1 and 9.2 t ha-1 of dry matter, respectively) which was 2.7 and 1.8 times more as compared to annual vetch and oat mixture. These perennial plants also determined accumulation of the highest content of biological N in roots and residues. According to N content applied with green manure, only lucerne aftermath was comparable to farmyard manure. Lucerne determined accumulation of the highest contents of total nitrogen (0.138%), humus (2.18%) and available phosphorus and potassium (130 and 279 mg kg-1 of soil, respectively) in the soil. Analysis of humus composition showed that its content in clay loam soil was rather stable, however, a slightly higher content of mobile humic acids was found after lucerne as a preceding crop when green manure or farmyard manure had been applied. When winter wheat was grown after lucerne as a preceding crop, the highest grain yield (on average 5.58 t ha-1) was obtained, which was 18.5 and 28.3% higher than that after clover or vetch and oat mixture. Protein content in winter wheat grain was to a greater extent determined by legume crops rather than organic manure.

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