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LONG-TERM EFFECTS OF AMENDMENTS ON PROSOPÍS JULIFLORA AND SOIL PROPERTIES OF A HIGHLY ALKALI SOIL

Gurbachan Singh
Journal of Tropical Forest Science
Vol. 8, No. 2 (December 1995), pp. 225-239
Stable URL: http://www.jstor.org/stable/43582480
Page Count: 15
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
LONG-TERM EFFECTS OF AMENDMENTS ON PROSOPÍS JULIFLORA AND SOIL PROPERTIES OF A HIGHLY ALKALI SOIL
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Abstract

This study was conducted for 8 y at the Gudha experimental farm of the Central Soil Salinity Research Institute, Karnal on a highly alkali soil with an initial pH of 10.3. The effect of four treatments of amendment [no amendments; 3kg gypsum; 3 kg gypsum + rice husk (RH) in 1:2 ratio of rice husk: soil on volume basis; and 3 kg gypsum + 8 kg farm yard manure (FYM) plant⁻¹] was evaluated in a field experiment in a randomized block design with four replications. Results indicated that during the initial 4y, 50% Prosopis died without amendments while only 19% died when 3 kg gypsum plant⁻¹ was used. Prosopis survival after 4 was 100% when RH and FYM were applied with gypsum. Height and girth of Prosopis recorded at 2-y intervals from planting up to 8 y were maximum in plots with gypsum + FYM, followed closely by those receiving gypsum + RH, gypsum and no amendment treatment. Similarly, the biomass accumulated in different parts of Prosopis in a growth period of 6 was 2.5,29.6,42.4 and 44.2 Mg ha-1 in control, gypsum, gypsum + RH and gypsum + FYM treatments respectively. The mean concentrations of Ca, and Mg in the leaf, stem and branch of 6-y-old Prosopis were less and that of Na was more when no amendment was used compared to the treatments where amendments were used. Uptake of N, P, K, Ca, Mg, S and Na by Prosopis in 6 y was higher in plots that received gypsum + FYM (1277.2 kg ha⁻¹), followed by gypsum+ RH (1198.3 kg ha⁻¹), gypsum (689.4 kg ha⁻¹) and in the control (58.5 kg ha⁻¹). Mean litter and pod yields of Prosopis recorded during the study period were markedly higher in amended soil than those without amendments. Total amounts of N, P, K, Ca, Mg, S and Na added to the site through Prosopis litter during the study period were 71.8,937.9,1557.6 and 1656.7 kg ha⁻¹ in no amendment, gypsum, gypsum + RH, and gypsum + FYM treatments respectively. The reduction in pH and EC and improvement in organic carbon and available N status of the soil were maximum in gypsum + FYM (probably due to better tree growth and higher litter fall in this treatment) and least in the no amendment treatment. A rough estimate about the likely effects of amendments on the soil nutrient balance showed a gain of 13,40,93, and 121 kg of N, P and K to the site in the control, gypsum, gypsum + RH, and gypsum + FYM treatments respectively. Kajian ke atas tanah beralkali tinggi di mana pH permulaannya ialah 10.3 telah dijalankan selama 8 tahun di kebun eksperimen Gudha di Institut Penyelidikan Saliniti Tanah Tengan, Karnal. Kesan empat rawatan perubahan [tanpa perubahan; 3 kg gipsum, 3 kg gipsum + sekam padi (RH) dalam nisbah 1:2 serkam pada : tanah berdasarkan isipadu; dan 3 kg gipsum + 8 kg baja kebun (FYM) tanaman⁻¹] telah dikaji didalam lapangan dalam rekabentuk blok rambang dengan empat ulangan. Keputusan menunjukkan dalam empat tahun pertama, 50% Prosopis mati dalam rawatan tanpa perubahan manakala cuma 19% mata apabila 3 kg gipsum tanaman⁻¹ digunakan. Kemandirian Prosopis selepas 4 tahun adalah 100% apabila RH dan FYM telah diberikan bersama gipsum. Ketinggian dan ukurlilit Prosopis yang direkod pada selang 2 tahun daripada penanaman hingga ke-8 tahun adalah maksimum dalam plot-plot yang mengandung gipsum + FYM, diikuti dengan plotplot yang menerima gipsum + RH, gipsum dan yang tidak menerima apa-apa perubahan. Biojisim yang terkumpul di bahagian-bahagian berlainan Prosopis dalam jangkamasa pertumbuhan selama 6 tahun ialah 2.5,29.6,42.4 dan 44.2 mg ha⁻¹ di dalam rawatan-rawatan kawalan, gipsum, gipsum + RH dan gipsum + FYM masing-masing. Purata kepekatan Ca, dan Mg dalam daun, ranting dan dahan Prosopis berumur 6 tahun adalah rendah. Kandungan Na adalah lebih tinggi dalam rawatan tanpa perubahan. Pengambilan N, P, K, Ca, Mg, S dan Na oleh Prosopis berumur 6 tahun adalah lebih tinggi bagi plot-plot yang menerima gipsum + FYM (1277.2 kg ha⁻¹), diikuti dengan gipsum+ RH (1198.3 kg ha⁻¹), gipsum (689.4kg ha⁻¹) dan kawalan (58.5 kg ha⁻¹). Purata sarap dan hasil pod Prosopis adalah lebih tinggi dalam tanah yang telah dirawat berbanding dengan kawalan. Jumlah kandungan N, P, K, Ca, Mg, S dan Na yang ditambah kepada tapak kawasan melalui sarap Prosopis semasa kajian ialah 71.8, 937.9,1557.6 dan 1656.7 kg ha⁻¹ di dalam kawalan, rawatan-rawatan gipsum, gipsum + RH dan FYM masing-masing. Penurunan dalam pH dan EC serta pembaikan dalam karbon organik dan status N dalam tanah adalah maksimum di gipsum + FYM (mungkin disebabkan tumbesaran pokok dan keguguran sarap yang lebih baik dalam rawatan tersebut) dan minimum dalam kawalan. Anggaran kasar ke atas kesan-kesan perubahan yang mungkin pada keseimbangan nutrien tanah menunjukkan keuntungan sebanyak 13,40,93 dan 121 kg N, P dan K kepada tanah dalam kawalan, rawatan-rawatan gipsum, RH + gipsum dan gipsum + FYM masing-masing.

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